update README.md (thanks to @guyroyse)

README.md

@@ -1,4 +1,4 @@
-> :warning: version 4 is still being developed and is not yet ready for any real production use. Please do not use it for any mission critical purpose at this time.
+> :warning: Version 4 is still under development and isn't ready for production use. Use at your own risk.
 
 ---
 
@@ -13,9 +13,10 @@
 ---
 
 <p align="center">
-    <a href="https://www.npmjs.com/package/redis"><img src="https://img.shields.io/npm/dm/redis.svg" alt="NPM downloads"></a>
-    <a href="https://www.npmjs.com/package/redis"><img src="https://img.shields.io/npm/v/redis.svg" alt="NPM version"></a>
-    <a href="https://discord.gg/XMMVgxUm"><img src="https://img.shields.io/discord/697882427875393627?style=flat-square" /></a>
+    <a href="https://www.npmjs.com/package/redis"><img src="https://img.shields.io/npm/dm/redis.svg" alt="NPM downloads"/></a>
+    <a href="https://www.npmjs.com/package/redis"><img src="https://img.shields.io/npm/v/redis/next" alt="NPM version"/></a>
+    <a href="https://coveralls.io/github/NodeRedis/node-redis?branch=v4"><img src="https://coveralls.io/repos/github/NodeRedis/node-redis/badge.svg?branch=v4" alt="Coverage Status"/></a>
+    <a href="https://discord.gg/XMMVgxUm"><img src="https://img.shields.io/discord/697882427875393627?style=flat-square"/></a>
 </p>
 
 ---
@@ -23,12 +24,132 @@
 ## Installation
 
 ```bash
-npm install redis
+npm install redis@next
+```
+
+## Usage
+
+### Basic Example
+
+```javascript
+(async () => {
+    const client = require('redis').createClient();
+
+    client.on('error', (err) => console.log('Redis Client Error', err));
+    
+    await client.connect();
+
+    await client.set('key', 'value');
+    const value = await client.get('key');
+})();
+```
+
+### Redis Commands
+
+There is built-in support for all of the [out-of-the-box Redis commands](https://redis.io/commands). They are exposed using the raw Redis command names (`HGET`, `HSET`, etc.) and a friendlier camel-cased version (`hGet`, `hSet`, etc.).
+
+```javascript
+// raw Redis commands
+await client.SET('key', 'value');
+await client.GET('key');
+
+// friendly JavaScript commands
+await client.hSet('key', 'field', 'value');
+await client.hGetAll('key');
+```
+
+Modifiers to commands are specified using a JavaScript object:
+
+```javascript
+await client.set('key', 'value', {
+    EX: 10,
+    NX: true
+});
+```
+
+Replies will be transformed to useful data structures:
+
+```javascript
+await client.hGetAll('key'); // { key1: 'value1', key2: 'value2' }
+await client.hKeys('key'); // ['key1', 'key2']
+```
+
+### Unsupported Redis Commands
+
+If you want to run commands and arguments that Node Redis doesn't know about (yet!) you can use `.sendCommand`:
+
+```javascript
+await client.sendCommand(['SET', 'key', 'value', 'NX']); // 'OK'
+
+await client.sendCommand(['HGETALL', 'key']); // ['key1', 'field1', 'key2', 'field2']
+```
+
+### Blocking Commands
+
+Any command can be run on a new connection by specifying the `duplicateConnection` option. The newly created connection is closed when command's `Promise` is fulfilled.
+
+This pattern works especially well for blocking commands—such as `BLPOP` and `BRPOPLPUSH`:
+
+```javascript
+const blPopPromise = client.blPop(
+    client.commandOptions({ duplicateConnection: true }),
+    'key'
+);
+
+await client.lPush('key', ['1', '2']);
+
+await blPopPromise; // '2'
+```
+
+### Pub/Sub
+
+Subscribing to a channel requires a dedicated Redis connection and is easily handled using events.
+
+```javascript
+await subscriber.subscribe('channel', message => {
+    console.log(message); // 'message'
+});
+
+await subscriber.pSubscribe('channe*', (message, channel) => {
+    console.log(message, channel); // 'message', 'channel'
+});
+
+await publisher.publish('channel', 'message');
+```
+
+### Lua Scripts
+
+You can define Lua scripts to create efficient custom commands:
+
+```javascript
+(async () => {
+    const client = require('redis').createClient({
+        scripts: {
+            add: require('redis/lua-script').defineScript({
+                NUMBER_OF_KEYS: 1,
+                SCRIPT:
+                    'local val = redis.pcall("GET", KEYS[1]);' +
+                    'return val + ARGV[1];',
+                transformArguments(key: string, toAdd: number): Array<string> {
+                    return [key, number.toString()];
+                },
+                transformReply(reply: number): number {
+                    return reply;
+                }
+            })
+        }
+    });
+
+    await client.connect();
+
+    await client.set('key', '1');
+    await client.add('key', 2); // 3
+})();
 ```
 
 ## Contributing
 
-Please see the [contributing guide](CONTRIBUTING.md).
+If you'd like to contribute, check out the [contributing guide](CONTRIBUTING.md).
 
 ## License