add doc for how to use MOCK puppet and writing new PUPPET

src/puppet-mock/README.md

+# PUPPET-MOCK
+
+```ts
+import PuppetMock from 'wechaty-puppet-mock'
+
+const puppet = new PuppetMock({
+  profile,
+})
+
+const wechaty = new Wechaty({
+  puppet,
+})
+```
+
+## HELPER UTILITIES
+
+### StateSwitch
+
+```ts
+this.state.on('pending')
+this.state.on(true)
+this.state.off('pending')
+this.state.off(true)
+
+await this.state.ready('on')
+await this.state.ready('off')
+
+```
+
+### Watchdog
+
+```ts
+```
+
+### Profile
+
+```ts
+this.profile.set('config', { id: 1, key: 'xxx' })
+const config = await this.profile.get('config')
+```
+