[DOC] Add README.md

Change-Id: I8455ed2bb673c2223652d80644ce2711fdea2280
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1580
Tested-by: Jenkins CI
Reviewed-by: Bernd Bieber <brotlee@zedat.fu-berlin.de>
Reviewed-by: Damla Durmaz <ddurmaz88@gmail.com>
Reviewed-by: Franz Zieris <zieris@inf.fu-berlin.de>

README.md

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+# Saros
+
+Saros is an Open Source IDE plugin for distributed collaborative software
+development.
+
+* All participants of a Saros session have an **identical local copy** of the
+  projects they work on.
+* They can work in their **usual IDE using all of its features** (currently
+  only Eclipse, IntelliJ IDEA support is coming soon).
+* Saros keeps their copies **in sync**, so everyone can work completely
+  **concurrently and in real-time**.
+
+Learn more about Saros: http://www.saros-project.org/
+
+## You want to contribute to Saros?
+
+Please take a look at our website: http://www.saros-project.org/getinvolved