Update readme with instructions for Eclipse

Author: VladUreche

readme.md

@@ -18,3 +18,9 @@ The tests (`sbt test`) don''t work yet.
 Notes: 
  * You will need the Scala IDE for 2.11.0-M7
  * There are 2 spurious version incompatibility warnings
+ * To run dotty in Eclipse:
+   * Navigate to `dotty.tools.dotc.Main`
+   * Run As ... > Scala Application
+   * then go to Run Configurations > Main$ > Classpath > Bootstrap entries:
+     * add the Scala library (Advanced... > Add library ... > Scala library)
+     * add the dotty classfiles (Add projects... > [x] dotty)