Improve developer contribution guide for Postgres development (uber#3495

)

CONTRIBUTING.md

@@ -2,11 +2,12 @@
 
 This doc is intended for contributors to `cadence` server (hopefully that's you!)
 
-**Note:** All contributors also need to fill out the [Uber Contributor License Agreement](http://t.uber.com/cla) before we can merge in any of your changes
+>Note: All contributors also need to fill out the [Uber Contributor License Agreement](http://t.uber.com/cla) before we can merge in any of your changes
 
 ## Development Environment
 
-* Go. Install on OS X with `brew install go`.
+* Golang. Install on OS X with `brew install go`. 
+>Note: If running into any compiling issue, make sure you upgrade to the latest stable version of Golang. 
 
 ## Checking out the code
 
@@ -59,6 +60,9 @@ make bins
 
 ## Testing
 
+>Note: The default setup of Cadence depends on Cassandra and Kafka(is being deprecated). 
+This section assumes you are testing with them, too. Please refer to [persistence documentation](https://github.com/uber/cadence/blob/master/docs/persistence.md) if you want to test with others like MySQL/Postgres. 
+
 Before running the tests you must have `cassandra`, `kafka`, and its `zookeeper` dependency:
 
 ```bash

docs/persistence.md

@@ -35,14 +35,49 @@ brew services start mysql
 cd $GOPATH/github.com/uber/cadence
 make install-schema-mysql
 ```
+When run tests and CLI command locally, Cadence by default uses a user `uber` with password `uber`, with privileges of creating databases. 
+You can use the following command to create user(role) and grant access. 
+In the mysql shell:
+```
+> CREATE USER 'uber' IDENTIFIED BY 'uber';
+> GRANT All Privileges to 'uber';
 
+```
 ### Start cadence server
 ```
 cd $GOPATH/github.com/uber/cadence
 cp config/development_mysql.yaml config/development.yaml
 ./cadence-server start --services=frontend,matching,history,worker
 ```
 
+## PostgresQL
+### Start PostgresQL server
+```
+brew install postgres
+brew services start postgres
+```
+When run tests and CLI command locally, Cadence by default uses a superuser `postgres` with password `cadence`.
+You can use the following command to create user(role) and grant access:
+```
+$psql postgres
+postgres=# CREATE USER postgres WITH PASSWORD 'cadence';
+CREATE ROLE
+postgres=# ALTER USER postgres WITH SUPERUSER;
+ALTER ROLE
+``` 
+### Install cadence schema
+```
+cd $GOPATH/github.com/uber/cadence
+make install-schema-postgres
+```
+
+### Start cadence server
+```
+cd $GOPATH/github.com/uber/cadence
+cp config/development_postgres.yaml config/development.yaml
+./cadence-server start --services=frontend,matching,history,worker
+```
+
 # Configuration
 ## Common to all persistence implementations
 There are two major sub-subsystems within cadence that need persistence - cadence-core and visibility. cadence-core is