Renames README files consistently.

Groovy/README.txt

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+Welcome to the Groovy Gilded Rose
+=================================
+
+to run the test, you can either:
+- run them from your favorite IDE
+  - make sure you have installed language support for Groovy
+  - IntelliJ:
+	- open project
+	- choose this folder (Groovy)
+  - Eclipse:
+    - new Groovy Project
+	- choose this folder (Groovy) as the project folder
+	- add JUnit to build path
+- run the test from the src/ folder in your shell:
+  - $ cd src/
+  - $ groovy com/gildedrose/GildedRoseTest.groovy
+