Added HACKING.md

Author: ysb33r

HACKING.md

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+== Running Tests
+
+This project has both unit tests and integration tests. In our context the distinguishing point is that integration tests
+need network connectivity, and unit tests need no more than local file system access. We also expect unit tests to be
+very quick, whereas integration tests are allowed to take a _little_ longer.
+
+Unit tests are in 'src/test' and integration tests are in 'src/integTest'. To run integration tests you would need to 
+do `./gradlew check` or `./gradlew build`. For unittests just doing `./gradlew test` is enough.
+
+Test logging is controlled via `logback-test.xml`. Be aware that integration tests generate a lot of debug information.
+Please do not commit the config file back with DEBUG turned on
+
+== Release HOWTO
+
+*TBC*