Added sfm.yaml example

sfm.yaml.example

@@ -0,0 +1,16 @@
+---
+
+# the default formula url
+formulas_url: https://github.com/saltstack-formulas/
+
+# where to store the new formulas (relative to current directory)
+formulas_dir: formulas
+
+# list of formulas to import
+formulas:
+  - vim
+  - users
+
+  - example:
+    name: example-formula
+    url: https://git.example.com/user/salt-example