Add README

README.md

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+Sonar Core
+==========
+
+This is the Core codebase of Sonar.
+
+Project homepage:
+http://www.sonarsource.org/
+
+Continuous inspection:
+http://nemo.sonarsource.org/dashboard/index/org.codehaus.sonar:sonar
+
+Issue tracking:
+http://jira.codehaus.org/browse/SONAR
+
+Wiki:
+http://docs.codehaus.org/display/SONAR