Added .gitattributes, contribution guide, and license from azure-even…

…t-hubs repo

.gitattributes

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+# Default behavior: if Git thinks a file is text (as opposed to binary), it
+# will normalize line endings to LF in the repository, but convert to your
+# platform's native line endings on checkout (e.g., CRLF for Windows).
+* text=auto
+
+# Explicitly declare text files you want to always be normalized and converted
+# to native line endings on checkout. E.g.,
+#*.c text
+
+# Declare files that will always have CRLF line endings on checkout. E.g.,
+#*.sln text eol=crlf
+
+# Declare files that will always have LF line endings on checkout. E.g.,
+*.sh text eol=lf
+
+# Denote all files that should not have line endings normalized, should not be
+# merged, and should not show in a textual diff.
+*.docm binary
+*.docx binary
+*.ico binary
+*.lib binary
+*.png binary
+*.pptx binary
+*.snk binary
+*.vsdx binary
+*.xps binary

contribute.md

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+## What to contribute
+There are many ways that you can contribute to the Azure Event Hubs client project:
+
+* Submit a bug
+* Submit a code fix for a bug
+* Submit code to add a new platform/language support to the project, or modify existing code
+* Submit additions or modifications to the documentation
+* Submit a feature request
+
+## Contributing Code
+To contribute code you need to issue a Pull Request against the develop branch. All code submissions will be reviewed and tested by the team, and those that meet a high bar for both quality and design/roadmap appropriateness will be merged into the source. Be sure to follow the existing file/folder structure when adding new boards or sensors.
+
+You must sign a [Contribution License Agreement](https://cla.microsoft.com/) ([CLA](https://cla.microsoft.com/)) before submitting a Pull Request. To complete the CLA, you will need to submit the request via the form and then electronically sign the CLA when you receive the email containing the link to the document.
+
+## Big contributions
+If your contribution is significantly big it is better to first check with the project developers in order to make sure the change aligns with the long term plans. This can be done simply by submitting a question via the GitHub Issues section.
+
+## Things to keep in mind when contributing
+Some guidance for when you make a contribution:
+
+* Add/update unit tests and code as required by your change
+* Make sure you run all the unit tests on the affected platform(s)/languages. If the change is in common code, generally running on one platform would be acceptable.
+* Run end-to-end tests or simple sample code to make sure the lib works in an end-to-end scenario.

license.txt

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+Microsoft Azure Event Hubs Libraries
+
+Copyright (c) Microsoft Corporation
+
+All rights reserved. 
+
+MIT License
+
+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.