Update README.md

README.md

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-HerobrineAI is plugin that creates Herobrine with custom AI and skin.
-But all it is likely true Herobrine legend with some improvements.
-Herobrine can be found randomly in the world or he can attack or haunt a player.
+HerobrineAI is server-side bukkit plugin for Minecraft that creates Herobrine with custom AI and skin.  
+Plugin has many features and it is based on the legend of Herobrine.  
+
+Contributing 
+---------
+This is an project and there are some parts of code that are poorly written, feel free to pull any refactored code.
 
 Building
 ---------
+**Maven with jdk7+ is required**
+
+**1. Clone project**  
+```
 git clone git://github.com/jakub1221/HerobrineAI.git 
+```
+
+**2. Install maven with jdk**  
+[Tutorial here](http://maven.apache.org/install.html)
+
+**3. Install Craftbukkit**  
+Plugin uses NMS code that is located in craftbukkit.  
+In order to get craftbukkit installed to local maven repository you need to run [BuildTools](https://www.spigotmc.org/wiki/buildtools/).
+
+**4. Build plugin**  
+```
+mvn clean install
+```
+Plugin will be located in target directory after building is done.
+
+Downloads
+---------
+You can download latest build from jenkins site [here](http://jenkins.logicshard.com/job/HerobrineAI/).