Update README to include Installation, features, options and settings (

#4)

README.md

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 # Autobot plugin for Discourse
+
+### Features:
+
+Currently it supports importing from below
+
+- YouTube Channel
+- Website RSS Feed
+- Twitter User Timeline
+
+### Options:
+
+- Can configure how frequent Discourse should poll from source for content.
+- Import content as either new topic or reply post for exsiting topic.
+- Setting custom owner username for improted posts.
+
+### Settings:
+
+- To import from any YouTube channels you have to configure Google API key in Site Settings.
+- To import tweets configure twitter consumer key and secret.
+
+### Further Development:
+
+- Ability to hide source URL for RSS feed imports. (via Campaign setting)
+
+# Installation:
+
+#### Register a YouTube API key. 
+(Taken from Google deveeloper docs: https://developers.google.com/youtube/v3/getting-started)
+  - You need a Google Account to access the Google Developers Console, request an API key, and register your application.
+  - Create a project in the Google Developers Console and obtain authorization credentials so your application can submit API requests.
+  - After creating your project, make sure the YouTube Data API is one of the services that your application is registered to use:
+  - Go to the Developers Console and select the project that you just registered.
+  - Open the API Library in the Google Developers Console. If prompted, select a project or create a new one. In the list of APIs, make sure the status is ON for the YouTube Data API v3.
+  - If your application will use any API methods that require user authorization, read the authentication guide to learn how to implement OAuth 2.0 authorization.
+  - Select a client library to simplify your API implementation.
+  - Familiarize yourself with the core concepts of the JSON (JavaScript Object Notation) data format. JSON is a common, language-independent data format that provides a simpleext representation of arbitrary data structures. For more information, see json.org.
+
+#### Add the plugin repo.
+ - cd /var/discourse/containers and edit app.yml .
+ - add repo to the plugin section:
+  ``- git clone https://github.com/vinkashq/discourse-autobot.git`` .
+ - cd /var/discourse & ``./launcer rebuild app`` .
+
+#### Setup plugin for YouTube.
+  - Once your app has rebuilt, navigate to ``/admin/plugins/autobot/campaigns`` in the browser
+  - create "New Campaign" filling in the required details.
+  - __Provider__: select YouTube.
+  - __Source__: choose Channel
+  - __Channel Id__: to obtain a YouTube channel's ID, go to channel URL, click on "Videos", the ID will be the value after ``/channel/`` and before ``/videos`` - copy this value into the "Channel Id" field.
+  - __Category__: selecting a category will import new videos to said cateory _or_ ..
+  - __Topic Id__: alternatively, selecting "Topic Id" will add each video as a reply to that topic. Topic Id can be obtained from going to a topic on discourse and noting the number at the end of the URL.
+  - __Polling Interval(in minutes)__: the polling interval is how long the plugin should reach out to the API.
+  - __Username for post ownership__: choose a username to be attributed to the posts.