Adding CONTRIBUTING.md and fixing up README.md, LICENSE

Author: Andrew Pardoe

CONTRIBUTING.md

@@ -0,0 +1,29 @@
+## Contributing to the Guidelines Support Library
+
+The Guidelines Support Library (GSL) contains functions and types that are suggested for use by the
+[C++ Core Guidelines](https://github.com/isocpp/CppCoreGuidelines). GSL design changes are made only as a result of modifications to the Guidelines. 
+
+GSL is accepting contributions that improve or refine any of the types in this library as well as ports to other platforms. Changes should have an issue 
+tracking the suggestion that has been approved the maintainers. Your pull request should include a link to the bug that you are fixing. If you've submitted 
+a PR, please post a comment in the associated issue to avoid duplication of effort.
+
+## Legal
+You will need to complete a Contributor License Agreement (CLA). Briefly, this agreement testifies that you are granting us and the community permission to 
+use the submitted change according to the terms of the project's license, and that the work being submitted is under appropriate copyright.
+
+Please submit a Contributor License Agreement (CLA) before submitting a pull request. You may visit https://cla.microsoft.com to sign digitally.
+
+## Housekeeping
+Your pull request should: 
+
+* Include a description of what your change intends to do
+* Be a child commit of a reasonably recent commit in the **master** branch 
+    * Requests need not be a single commit, but should be a linear sequence of commits (i.e. no merge commits in your PR)
+* It is desirable, but not necessary, for the tests to pass at each commit. Please see [README.md](./README.md) for instructions to build the test suite. 
+* Have clear commit messages 
+    * e.g. "Fix issue", "Add tests for type", etc.
+* Include appropriate tests 
+    * Tests should include reasonable permutations of the target fix/change
+    * Include baseline changes with your change
+    * All changed code must have 100% code coverage
+* To avoid line ending issues, set `autocrlf = input` and `whitespace = cr-at-eol` in your git configuration

LICENSE

@@ -2,6 +2,16 @@ Copyright (c) 2015 Microsoft Corporation. All rights reserved.
 
 This code is licensed under the MIT License (MIT). 
 
+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 

README.md

@@ -1,16 +1,19 @@
 # GSL: Guidelines Support Library
 
-This library contains functions and types that are suggested for use by the
-[C++ Coding Guidelines](https://github.com/Microsoft/CppCodingStandards/).
+The Guidelines Support Library (GSL) contains functions and types that are suggested for use by the
+[C++ Core Guidelines](https://github.com/isocpp/CppCoreGuidelines) maintained by the [Standard C++ Foundation](isocpp.org). 
+This repo contains Microsoft's implementation of GSL, tracking Microsoft's fork of the Guidelines. Microsoft's fork can be found here:
+[C++ Core Guidelines](https://github.com/Microsoft/CppCoreGuidelines). 
 
-These include types like `array_view<>`, `string_view<>`, `owner<>` and others.
+The library includes types like `array_view<>`, `string_view<>`, `owner<>` and others.
 
 The entire implementation is provided inline in the headers under the [include](./include) directory.
 
 While some types have been broken out into their own headers (e.g. [include/array_view.h](./include/array_view.h)),
 it is simplest to just include [gsl.h](./include/gsl.h) and gain access to the entire library.
 
-> NOTE: We encourage contributions that improve or refine any of the types in this library.
+> NOTE: We encourage contributions that improve or refine any of the types in this library as well as ports to
+other platforms. Please see [CONTRIBUTING.md](./CONTRIBUTING.md) for more information about contributing. 
 
 # Quick Start
 ## Supported Platforms
@@ -23,8 +26,8 @@ The test suite that exercises GSL has been built and passes successfully on the
 * Linux using Clang\LLVM 3.6
 * Linux using GCC 5.1
 
-> If you successfully port GSL to another platform, we would love to hear from you. Please consider contributing
-any changes that were necessary back to this project to benefit the wider community. 
+> If you successfully port GSL to another platform, we would love to hear from you. Please submit an issue to let us know. Also please consider 
+contributing any changes that were necessary back to this project to benefit the wider community. 
 
 ## Building the tests
 To build the tests, you will require the following: