Add Redis.io code examples

- Add set & get example
- Use bash script to test doc tests
- Add package.json to doctests
- Add search-quickstart

doctests/string-set-get-example.js

@@ -0,0 +1,26 @@
+// EXAMPLE: set_and_get
+// REMOVE_START
+import assert from "assert";
+// REMOVE_END
+
+// HIDE_START
+import { createClient } from 'redis';
+
+const client = createClient();
+
+client.on('error', err => console.log('Redis Client Error', err));
+
+await client.connect();
+
+// HIDE_END
+await client.set('bike:1', 'Process 134');
+const value = await client.get('bike:1');
+console.log(value);
+// returns 'Process 134'
+//REMOVE_START
+assert.equal(value, 'Process 134');
+//REMOVE_END
+
+// HIDE_START
+await client.quit();
+// HIDE_END