Merge pull request #37 from xujyan/docs

Add a simple docs/README.md.
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+# Mysos
+Mysos is an Apache Mesos framework for running MySQL instances. It dramatically simplifies the management of a MySQL cluster and is designed to offer:
+
+ * Efficient hardware utilization through multi-tenancy (in performance-isolated containers)
+ * High reliability through preserving the MySQL state during failure and automatic backing up to/restoring from HDFS
+ * An automated self-service option for bringing up new MySQL clusters
+ * High availability through automatic MySQL master failover
+ * An elastic solution that allows users to easily scale up and down a MySQL cluster by changing the number of slave instances
+
+Mysos is also being [proposed as a project in the Apache Incubator](https://wiki.apache.org/incubator/MysosProposal).