add a twitter service

twitter/README.md

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+# Twitter Service
+
+This is the Twitter service
+
+Generated with
+
+```
+micro new twitter
+```
+
+## Usage
+
+Create a new app in the twitter [developer portal](https://developer.twitter.com/en/apps).
+
+Then set the config for the api token, secret, consumer key and consumer secret
+
+```
+micro config set twitter.api_token xxxx
+micro config set twitter.api_token_secret xxxx
+micro config set twitter.consumer_key xxxx
+micro config set twitter consumer_secret xxxx
+```
+
+Now tweet stuff
+
+```
+micro twitter api tweet --status "Tweeting via a microservice"
+```
+
+