[Sriram] Add contributing, license and gitattributes

Author: nsriram

.gitattributes

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+*.md linguist-detectable=true
+*.md linguist-documentation=false
+samples/**/*.js linguist-detectable=true
+samples/**/*.js linguist-documentation=false
+samples/**/*.json linguist-detectable=true
+samples/**/*.json linguist-documentation=false

CONTRIBUTING.md

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+# Contributing to 'Lambda the Terraform Way'
+Always looking for suggestions, improvements to improve code base and to add new features.
+
+### Tools required
+- Your favorite text editor
+- AWS CLI, Terraform, AWS SDK, NodeJS runtime, KeybaseApp
+
+### Steps/Suggestions for contributing
+1. Clone the repo
+2. Make your edits, following the same format as other sections
+3. Provide (tested) samples if required
+4. Make your commit messages in present tense

LICENSE

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+MIT License
+
+Copyright (c) 2020 Sriram Narasimhan
+
+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.