Add README.md

Author: fredeil

README.md

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+# MongoDB GridFS orphaned chunks cleanup (MGOCC)
+
+The MGOCC program searches trough every chunk in GridFS to determine whether a file and it's chunks are orphaned or not.
+
+## Required stuff
+
+Only three things are needed for this program to work:
+
+* `MongoConnectionString` the connection string to your MongoDB cluster
+* `DryRun` if you are an anxious individual you might want to see how many deletions would be performed
+* Patience, a lot of patience.
+
+## Legal stuff
+
+GPL v3.0 so use this at your own risk.