Update README with install instructions.

README.md

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+jsh
+===
+
+An augmented Unix userland. Makes your core utility functions a bit cooler by
+adding a --json flag that makes everything output in nice, serialized JSON.
+
+## Assumptions
+
+* You have the following binaries (usually found in your distro's coreutils
+  packages)
+    * /usr/bin/ps
+* You have Go installed
+
+We're working on making it so that they don't have to be in those directories.
+
+## Installing
+
+* git clone this directory
+* cd into the directory
+* set the GOPATH environment variable to the directory
+
+### ps
+
+* $ go install "jsh/ps"
+* $ bin/ps