Reenstated CONTRIBUTING.md

CONTRIBUTING.md

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+# Bylaws for the committers of FitNesse.
+
+1.  Use the coding style that you'll see in the 
+    [extra/util/fitnesse.xml](https://github.com/unclebob/fitnesse/blob/master/extra/util/fitnesse.xml) file. 
+    This is an IntelliJ IDEA file. You can move it into the `codestyles` directory somewhere beneath IntelliJ preferences home.  I found it on my MAC
+    in `~/Library/Preferences/IntelijIDEA8/codestyles`.
+    If you can't use this file in your IDE then look carefully then you can emulate any of the source files in FitNesse.
+    Remember that **indentation level is 2 spaces**, and we **never use tabs**.  Braces follow K&R style:
+    ```
+      void f() {
+        //
+      }
+    ```
+
+2.  Never commit changes without running BOTH the unit tests AND the acceptance tests.  The ant target 'all' in
+    the build.xml file will run them both, but it's slow.  I just use the IDE to run the unit tests, and then run the
+    acceptance tests with FitNesse.
+
+3.  Please don't rush.  You are never in a hurry with FitNesse.  There are no deadlines.  Keep this code as clean
+    as you can.  Maintain the highest pride in your workmanship.  Don't make messes.  See the "Clean Code" book for more.
+
+4.  Whenever you make a change, add a few sentences to the changeLog.txt file describing your changes.  We used this file
+    to build the release notes.
+
+5.  If you have any questions, ask [Uncle Bob](https://github.com/unclebob).
+