[jo] add README.md

This is for #1252.

Signed-off-by: Stephan Renatus <srenatus@chef.io>

jo/README.md

@@ -0,0 +1,39 @@
+# jo
+
+This package provides the jo binary.
+
+[jo](https://github.com/jpmens/jo) is a utility to create JSON objects on the
+command line.
+
+## Maintainers
+
+The Habitat Maintainers humans@habitat.sh
+
+## Type of Package
+
+[binary wrapper package](https://www.habitat.sh/docs/best-practices/#binary-wrapper-packages)
+
+## Usage
+
+```
+$ hab pkg install core/jo
+$ hab pkg binlink core/jo
+$ jo -h
+Usage: jo [-a] [-B] [-p] [-v] [-V] [word...]
+        word is key=value or key@value
+        -a creates an array of words
+        -B disable boolean true/false
+        -p pretty-prints JSON on output
+        -v show version
+        -V show version in JSON jo
+$ jo -p foo=bar baz=$(jo -a x y z) true@1
+{
+   "foo": "bar",
+   "baz": [
+      "x",
+      "y",
+      "z"
+   ],
+   "true": true
+}
+```