Add GitHub templates

Author: Caitlin Bales (MSFT)

.github/ISSUE_TEMPLATE.md

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+<!-- Read me before you submit this issue
+
+First off, thank you for taking the time to open this issue! We do appreciate it. Please bear with us if we don't get to this right away.
+
+If this is a question about the Microsoft Graph service API, or a question about how to use this SDK, please post your question to StackOverflow with the [microsoftgraph] tag.
+https://stackoverflow.com/questions/tagged/microsoft-graph
+
+This repo is for the Microsoft Graph Java SDK. Issues opened in this repo should only target this SDK.
+
+Before you open this issue, did you:
+- Search the issues to determine whether someone already opened this issue?
+- Search StackOverflow for an answer?
+- Capture the repro steps and gather the information requested in the steps below to reproduce your scenario?
+- Review the samples under github.com/microsoftgraph? They can help for some scenarios.
+- Take a look at the functional tests in this repo? They may have an example for you. See the [functional tests](https://github.com/microsoftgraph/msgraph-sdk-java/tree/master/src/test/java/com/microsoft/graph/functional)
+
+-->
+
+Please provide the following (and please check them off the list with [x]) before submitting this issue:
+- [ ] Expected behavior. Please provide **links to the specific [Microsoft Graph documentation](https://developer.microsoft.com/en-us/graph/docs/concepts/overview)** you used to determine the expected behavior. 
+- [ ] Actual behavior. Provide error codes, stack information, and a [Fiddler](http://www.telerik.com/fiddler) capture of the request and response (please remove personally identifiable information before posting).
+- [ ] Steps to reproduce the behavior. Include your code, IDE versions, client library versions, and any other information that might be helpful to understand your scenario.
+
+### Expected behavior
+
+
+
+
+### Actual behavior
+
+
+
+
+### Steps to reproduce the behavior
+
+
+
+

.github/PULL_REQUEST_TEMPLATE.md

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+<!-- Read me before you submit this pull request
+
+First off, thank you for opening this pull request! We do appreciate it.
+
+The requests and models for this client library are generated. We won't be accepting pull requests for those code files. With that said, we do appreciate
+it when you open pull requests with the proposed file changes, as we'll use that to help guide us in updating our template files.
+
+-->
+
+<!-- Optional. Set the issues that this pull request fixes. Delete 'Fixes #' if there isn't an issue associated with this pull request. -->
+Fixes #
+
+<!-- Required. Provide specifics about what the changes are and why you're proposing these changes. -->
+### Changes proposed in this pull request
+-
+
+<!-- Optional. Provide related links. This might be other pull requests, code files, StackOverflow posts. Delete this section if it is not used. -->
+### Other links
+-