Convert README to markdown

Change-Id: I6bf7540a5959d00d64f7f2463134f609ca30e4e8

BUILDING

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 To build Perkeep:
 
-1) Install Go 1.5 or later.
+1) Install Go 1.9 or later.
 
 2) cd to the root of the Perkeep source (where this file is)
 

README

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-Perkeep is your personal storage system.
-
-It's a way to store, sync, share, import, model, and back up content.
-Keep your stuff for life.
-
-For more, see:
-
-     https://perkeep.org/
-     https://perkeep.org/doc/
-
-Other useful files:
-
-     BUILDING       how to compile it ("go run make.go")
-     CONTRIBUTING   how to do development and contribute
-
-Mailing lists:
-
-     http://perkeep.org/lists
-
-Bugs and contributing:
-
-     https://github.com/perkeep/perkeep/issues
-     https://perkeep.org/doc/contributing

README.md

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+# Perkeep is your personal storage system.
+
+> It's a way to store, sync, share, import, model, and back up content.  Keep your stuff for life.
+
+### For more, see
+
+- [Perkeep Home](https://perkeep.org/)
+- [Perkeep Docs](https://perkeep.org/doc/)
+
+### Other useful files
+
+- [BUILDING](BUILDING) - how to compile it ("go run make.go")
+- [CONTRIBUTING](CONTRIBUTING.md) - how to do development and contribute
+
+### Perkeep Resources
+
+- [Community](http://perkeep.org/community)
+- [Bugs and Issues](https://github.com/perkeep/perkeep/issues)
+- [Contributing](https://perkeep.org/code#contributing)