Added postgres storage for botbuilder

libraries/botbuilder-storage-pg/.gitignore

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+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# TypeScript v1 declaration files
+typings/
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+
+# next.js build output
+.next
+
+lib/
+
+test/

libraries/botbuilder-storage-pg/.npmignore

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+node_modules/
+test/

libraries/botbuilder-storage-pg/README.md

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+# Bot Builder PostgreSQL Storage
+
+This is a simple storage adapter for PostgreSQL.
+
+## Installation
+
+```powershell
+npm install @botbuildercommunity/storage-pg --save
+```
+
+## Usage
+
+```typescript
+import { PostgreSQLStorage } from '@botbuildercommunity/storage-pg';
+
+const storage = new PostgreSQLStorage({ 
+    user: <DATABASE_USERNAME>,
+    password: <DATABASE_PASSWORD>,
+    server: <DATABASE_SERVER>,
+    database: <DATABASE_NAME>,
+    table: <DATABASE_TABLE>
+});
+
+const conversationState = new ConversationState(storage);
+const userState = new UserState(storage);
+```
+
+> This module uses the [node-pg](https://www.npmjs.com/package/pg) package for SQL connectivity. The `PostgreSQLOptions` that is passed to the `PostgreSQLStorage` object extends the `config` object of that package. All options from that `config` option can be passed in.
+
+> This module assumes two columns in your database table: `id` with datatype `VARCHAR(255)` and `data` with `JSONB` respectively.