Merge pull request #41 from cucumber/doc-about-building

Add Building doc

Author: gaeljw

CONTRIBUTING.md

@@ -12,5 +12,6 @@ Please use this Github project for contributing, either through an issue or a Pu
 
 These pages aim to help Cucumber Scala developers understand the codebase.
 
-- [Scala implementation details](docs/scala_implementation.md)
+- [Building](docs/building.md)
 - [Project structure](docs/project_structure.md)
+- [Scala implementation details](docs/scala_implementation.md)

docs/building.md

@@ -0,0 +1,22 @@
+# Building
+
+## Maven toolchain
+
+This project uses Maven Toolchain plugin.
+
+To compile it, you will need to define a toolchain like following in `~/.m2/toolchains.xml`:
+```xml
+<?xml version="1.0" encoding="UTF8"?>
+<toolchains>
+    <toolchain>
+        <type>jdk</type>
+        <provides>
+            <version>8</version>
+            <vendor>openjdk</vendor>
+        </provides>
+        <configuration>
+            <jdkHome>/usr/lib/jvm/java-1.8.0-openjdk-amd64</jdkHome>
+        </configuration>
+    </toolchain>
+</toolchains>
+```