Port index (more or less) from existing docs

Home.md

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-Welcome to the weed-fs wiki!
+# Welcome to the SeaweedFS wiki!
+
+These are the official docs for SeaweedFS, superseding the Google Code wiki and the Read The Docs site.
+
+For pre-compiled releases, https://bintray.com/chrislusf/Weed-FS/seaweed
+
+Contents:
+
+- [[Getting Started]]
+- [[Client Libraries]]
+- [[API]]
+- [[Replication]]
+- [[Store file with a Time To Live]]
+- [[Failover Master Server]]
+- [[Directories and Files]]
+- [[Distributed Filer]]
+- [[Use Cases]]
+- [[Optimization]]
+- [[Benchmarks]]
+- [[Change List]]