added liscence file

LICENSE

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+MIT License
+
+Copyright (c) 2019 Nipun Sampath
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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 ## Ballerina syntax for sublime text 3
 
-Ballerina syntax highlighting and autocompletion package for Sublime Text 3.
+Provides:
 
+* Syntax Highlighting
+* Autocompletion 
+
+for ballerina source files on Sublime Text 3.
+
+### Installation 
+
+#### - Manual Installation
+
+Clone the repository in `Sublime installation path\Packages\User` diectory
+
+#### - Via Package Control 
+
+Not yet supported.
+
+### Autocompletion Hot Keys
+
+* Move forward through fields&nbsp;&nbsp;&nbsp; =&nbsp; <kbd>tab</kbd>
+* Move backward through fields =&nbsp; <kbd>shift</kbd> + <kbd>tab</kbd>
+
+
+Shout-out to [ballerina-attic](https://github.com/ballerina-attic) for acting as a reference point for some of the regexes used here.