docs: include pg and pool usage examples (#17)

* docs: include `pg` and `pool` usage examples

* docs: improve usage examples

* docs: improve names

* docs: improve comments

* docs: add table of contents

README.md

@@ -1,8 +1,23 @@
 # AWS SSL Profiles
 
-[**AWS RDS**](https://aws.amazon.com/rds/) Certificates Bundles.
+[**AWS RDS**](https://aws.amazon.com/rds/) **SSL** Certificates Bundles.
 
-## Install
+**Table of Contents**
+
+- [Installation](#installation)
+- [Usage](#usage)
+  - [**mysqljs/mysql**](#mysqljsmysql)
+  - [**MySQL2**](#mysql2)
+  - [**node-postgres**](#node-postgres)
+  - [Custom `ssl` options](#custom-ssl-options)
+- [License](#license)
+- [Security](#security)
+- [Contributing](#contributing)
+- [Acknowledgements](#acknowledgements)
+
+---
+
+## Installation
 
 ```bash
 npm install --save aws-ssl-profiles
@@ -12,14 +27,87 @@ npm install --save aws-ssl-profiles
 
 ## Usage
 
+### [mysqljs/mysql](https://github.com/mysqljs/mysql)
+
 ```js
+const mysql = require('mysql');
 const awsCaBundle = require('aws-ssl-profiles');
 
-// mysql or mysql2 connection
+// mysql connection
 const connection = mysql.createConnection({
   //...
   ssl: awsCaBundle,
 });
+
+// mysql connection pool
+const pool = mysql.createPool({
+  //...
+  ssl: awsCaBundle,
+});
+```
+
+### [MySQL2](https://github.com/sidorares/node-mysql2)
+
+```js
+const mysql = require('mysql2');
+const awsCaBundle = require('aws-ssl-profiles');
+
+// mysql2 connection
+const connection = mysql.createConnection({
+  //...
+  ssl: awsCaBundle,
+});
+
+// mysql2 connection pool
+const pool = mysql.createPool({
+  //...
+  ssl: awsCaBundle,
+});
+```
+
+### [node-postgres](https://github.com/brianc/node-postgres)
+
+```js
+const pg = require('pg');
+const awsCaBundle = require('aws-ssl-profiles');
+
+// pg connection
+const client = new pg.Client({
+  // ...
+  ssl: awsCaBundle,
+});
+
+// pg connection pool
+const pool = new pg.Pool({
+  // ...
+  ssl: awsCaBundle,
+});
+```
+
+### Custom `ssl` options
+
+Using **AWS SSL Profiles** with custom `ssl` options:
+
+```js
+{
+  // ...
+  ssl: {
+    ...awsCaBundle,
+    rejectUnauthorized: true,
+    // ...
+  }
+}
+```
+
+```js
+{
+  // ...
+  ssl: {
+    ca: awsCaBundle.ca,
+    rejectUnauthorized: true,
+    // ...
+  }
+}
 ```
 
 ---

package.json

@@ -37,9 +37,13 @@
   "keywords": [
     "mysql",
     "mysql2",
+    "pg",
+    "postgres",
     "aws",
     "rds",
     "ssl",
+    "certificates",
+    "ca",
     "bundle"
   ],
   "scripts": {