added link to new main repo

CONTRIBUTING.md

@@ -2,3 +2,5 @@ Rules regarding composing this FAQ and making contributions
 * Use anchors to any sections you add, include images if they would help, give your opinion.
 * Write personal experience and include your name in the bits you add.
 * Make your own branch named after yourself, all merges will be accepted.
+
+Main repo moved (here)[https://lab.nexedi.cn/saurabh.bansod/nexedi_lille/]
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