Add issue template (#200)

.github/ISSUE_TEMPLATE.md

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+<!-- Before opening an issue here make sure, that you have read the template completly through -->
+
+When asking general "how to" questions:
+
+- Please do not open an issue here!
+- Instead, ask for help on [StackOverflow](https://stackoverflow.com/) with Materialize and Angular tags.
+
+- Read the [CONTRIBUTING document](https://github.com/sherweb/ng2-materialize/blob/CONTRIBUTING.md) Any issues that are violating the contributing guidelines, will be closed!
+- [Search for duplicate or closed issues](https://github.com/sherweb/ng2-materialize/issues?utf8=%E2%9C%93&q=is%3Aissue) and make sure that is not an issue related to Materialize or other library.
+- Prepare a [reduced test case](https://css-tricks.com/reduced-test-cases/) for any bugs.
+
+<!--- Provide a general summary of the issue in the Title above. -->
+
+## Expected Behavior
+<!--- If you're describing a bug, tell us what should happen. -->
+
+## Current Behavior
+<!--- If describing a bug, tell us what happens instead of the expected behavior. -->
+
+<!--- If suggesting a change/improvement, explain the difference from current behavior. -->
+
+## Possible Solution
+<!--- Not obligatory, but suggest a fix/reason for the bug, -->
+<!--- or ideas how to implement the addition or change. -->
+
+## Steps to Reproduce (for bugs)
+<!--- Provide a link to a live example, or an unambiguous set of steps to reproduce this bug. Include code to reproduce, if relevant. -->
+1.
+2.
+3.
+4.
+
+## Context
+<!--- How has this issue affected you? What are you trying to accomplish? -->
+<!--- Providing context helps us come up with a solution that is most useful in the real world -->
+
+## Your Environment
+<!--- Include as many relevant details about the environment you experienced the bug in -->
+* Version used:
+* Angular version used:
+* Browser Name and version:
+* Operating System and version (desktop or mobile):
+* Link to your project (if appropriate):