Postgres Example (#490)

* creating postgres example - fixes #489

* postgres example glide fix

* all the changes

* use fn call

* removing func.yaml

* removing build.sh

* test.sh cleanup

examples/postgres/README.md

@@ -0,0 +1,25 @@
+# Postgres INSERT/SELECT Function Image
+
+This function executes an INSERT or SELECT against a table in a given postgres server.
+
+```
+# Create your func.yaml file
+fn init <YOUR_DOCKERHUB_USERNAME>/func-postgres
+# Build the function
+fn build
+# Test it
+./test.sh
+# Push it to Docker Hub
+fn push
+# Create routes to this function on IronFunctions
+fn apps create <YOUR_APP> --config SERVER=<POSTGRES>
+fn routes create --config TABLE=<TABLE_NAME> --config COMMAND=INSERT <YOUR_APP> /<TABLE_NAME>/insert
+fn routes create --config TABLE=<TABLE_NAME> --config COMMAND=SELECT <YOUR_APP> /<TABLE_NAME>/select
+```
+
+Now you can call your function on IronFunctions:
+
+```
+echo <JSON_RECORD> | fn call /<YOUR_APP>/<TABLE_NAME>/insert
+echo <JSON_QUERY> | fn call /<YOUR_APP>/<TABLE_NAME>/select
+```