copy contribution content and write some info about plugins

contribute/index.markdown

@@ -6,5 +6,76 @@ layout: default
 Contribute
 ==========
 
-Here will info about contribution.
+The easiest way to extend functionality of Angry IP Scanner is to [write a plugin](plugins.html).
+
+Angry IP Scanner's source code is hosted is hosted on [Github](https://github.com/angryziber/ipscan).
+Forking and pull-requests are very welcome! If you want to get an idea of what to do, check the [bug reports](https://sourceforge.net/p/ipscan/bugs/).
+
+In order to get the source code, the following command must be run (make sure you have git installed):
+
+    git clone git://github.com/angryziber/ipscan.git
+
+This command will fetch the current source code of the program with full history into local directory named 'ipscan'.
+Or just [https://github.com/angryziber/ipscan browse the code repository on Github].
+
+If the source of particular release is required, then you can later switch to particular tag using:
+
+    git checkout tag-name
+
+where tag-name is the released version number (eg 3.0-beta4), for full list of available tags use:
+
+    git tag
+
+Then, in order to build the binaries, you need only to run 'ant' in the 'ipscan' directory.
+Ant will use the standard build.xml script there and compile, test, and package the program for all platforms.
+Note: some packaging features were tested only on Linux.
+
+The source code tree also includes the preconfigured Intellij IDEA project for convenience.
+After opening the project in IDEA, make sure you add to the build path the appropriate directory from src-platform
+according to the OS you are currently using as well as the correct swt jar file from ext/swt.
+Then, it can be run using the net.azib.ipscan.Main class.
+
+Translations
+------------
+
+If you know some language other than English well, then please help translating Angry IP Scanner into that language.
+
+For that, you need to take the latest [resources/messages.properties](https://github.com/angryziber/ipscan/blob/master/resources/messages.properties) file,
+copy it with the ISO 2-letter language suffix (eg messages_et.properties), translate all the messages and send to me by email (or make a pull request).
+
+To test your translations, run Angry IP Scanner from the command-line (assuming that the translated file is in the same directory as the original jar or exe):
+
+    java -cp . -jar ipscan-xxx.jar
+
+Source structure
+----------------
+
+### Directories
+
+* src - the main subdirectory of the project tree, which contains the Java package structure of the source (net.azib.ipscan and its sub packages). All the source code, needed for running the program is stored there.
+* src-platform - platform-specific source code. Use the appropriate subdirectory for your OS (linux, linux64, mac or win32) when compiling/running.
+* test - contains exactly the same Java package structure as src does, but is intended for unit tests and other classes, which are not needed for running Angry IP Scanner itself. Each test case Java class should have the same name as the original class under test, but with the Test suffix, for example, Feeder and FeederTest.
+* ext - for external libraries. The contents of each library's directory will depend on the original structure of that library, however, not all the original files may be included.
+* resources - textual and graphical resources to be packaged with the program.
+
+### Java packages
+
+Angry IP Scanner source code is in the net.azib.ipscan Java package.
+
+* [net.azib.ipscan.config](https://github.com/angryziber/ipscan/blob/master/src/net/azib/ipscan/config) - classes, related to configuration
+* [net.azib.ipscan.core](https://github.com/angryziber/ipscan/blob/master/src/net/azib/ipscan/core) - core scanner classes
+* [net.azib.ipscan.core.state](https://github.com/angryziber/ipscan/blob/master/src/net/azib/ipscan/core/state) - scanner's state machine implementation
+* [net.azib.ipscan.feeders](https://github.com/angryziber/ipscan/blob/master/src/net/azib/ipscan/feeders) - all [feeder](plugins.html) implementations
+* [net.azib.ipscan.fetchers](https://github.com/angryziber/ipscan/blob/master/src/net/azib/ipscan/fetchers) - all [fetcher](plugins.html) implementations
+* [net.azib.ipscan.exporters](https://github.com/angryziber/ipscan/blob/master/src/net/azib/ipscan/exporters) - all [exporter](plugins.html) implementations
+* [net.azib.ipscan.gui](https://github.com/angryziber/ipscan/blob/master/src/net/azib/ipscan/gui) - for GUI packages and classes (which are separate from the core functionality)
+* [net.azib.ipscan.gui.actions](https://github.com/angryziber/ipscan/blob/master/src/net/azib/ipscan/gui/actions) - most GUI listeners, such as menu item and button handlers
+
+### Dependency injection
+
+Angry IP Scanner uses [dependency injection pattern](http://en.wikipedia.org/wiki/Dependency_injection) in its design,
+provided by the [PicoContainer library](http://www.picocontainer.org/), which was chosen for being lightweight (adds about 60 kb).
+
+PicoContainer encourages constructor injection, i.e. classes declare all required dependencies in their constrcutors, and container then resolves these dependencies (mostly) automatically, so that the classes themselves don't have to worry where these dependencies come from. This eases both development and unit testing of the code.
+Components are registered in the [ComponentRegistry](https://github.com/angryziber/ipscan/blob/master/src/net/azib/ipscan/core/ComponentRegistry.java) class.
 

contribute/plugins.markdown

@@ -0,0 +1,32 @@
+---
+title: Plugins
+layout: default
+---
+
+Plugins
+=======
+
+Plugins for Angry IP Scanner are distributed as standard .jar files and are also written in Java to be cross-platform.
+
+Please let me know if you have an interesting plugin you would like to share here.
+
+Angry IP Scanner looks for plugin .jar files on start in:
+- The same directory where ipscan binary is located (.jar or .exe)
+- User-specific $HOME/.ipscan directory
+
+For more info on how plugin loading works, see [PluginLoader.java](https://github.com/angryziber/ipscan/blob/master/src/net/azib/ipscan/core/PluginLoader.java).
+
+Writing plugins
+---------------
+
+The plugin's jar file must have a META-INF/MANIFEST.MF entry 'IPScan-Plugins' that lists full Java class names of all plugins
+container in the jar file.
+
+A plugin is an implementation of one of the following interfaces:
+
+- Fetcher - corresponds to a column in the result list, fetches data from scanned IP addresses
+- Pinger - these guys detect whether an IP is dead or alive
+- Exporter - used for exporting the scanning results
+- Feeder - these guys generate IP address sequence to scan (feed the scanner)
+
+Look at [the source code](https://github.com/angryziber/ipscan) for examples of how the core plugins are implemented.