Adding git + pip as source engine

Change-Id: I811a0876d806cfcd213ddf746b8ec89f4909fe64
diff --git a/README.rst b/README.rst
index 66883b8..aab9378 100644
--- a/README.rst
+++ b/README.rst
@@ -3,7 +3,7 @@
 Reclass Formula
 ===============
 
-reclass is an “external node classifier” (ENC) as can be used with automation
+reclass is an "external node classifier" (ENC) as can be used with automation
 tools, such as Puppet, Salt, and Ansible. It is also a stand-alone tool for
 merging data sources recursively.
 
@@ -11,6 +11,33 @@
 Sample Metadata
 ===============
 
+Install sources from [repository, git, pip]
+
+
+.. code-block:: yaml
+
+    salt:
+      source:
+        engine: pkg
+    ...
+      source:
+        engine: git
+        repo: git+https://github.com/salt-formulas/reclass
+        branch: master
+    ...
+      source:
+        engine: pip
+    ...
+
+If reclass is pre-installed, set the engine to None to avoid updates.
+
+.. code-block:: yaml
+
+    salt:
+      source:
+        engine: None
+
+
 Reclass storage with data fetched from git
 
 .. literalinclude:: tests/pillar/storage_git.sls