chore(github): add PR and issue templates

.github/ISSUE_TEMPLATE.md

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+<!--
+IF YOU DON'T FILL OUT THE FOLLOWING INFORMATION WE MIGHT CLOSE YOUR ISSUE WITHOUT INVESTIGATING
+-->
+
+**I'm submitting a ...**  (check one with "x")
+```
+[ ] bug report => search github for a similar issue or PR before submitting
+[ ] feature request
+[ ] support request => Please do not submit support request here, instead see https://github.com/HackedByChinese/ng2-idle/blob/master/CONTRIBUTING.md#getting-help
+```
+
+**Current behavior**
+<!-- Describe how the bug manifests. -->
+
+**Expected behavior**
+<!-- Describe what the behavior would be without the bug. -->
+
+**Minimal reproduction of the problem with instructions**
+<!--
+If the current behavior is a bug or you can illustrate your feature request better with an example,
+please provide the *STEPS TO REPRODUCE* and if possible a *MINIMAL DEMO* of the problem.
+-->
+
+**What is the motivation / use case for changing the behavior?**
+<!-- Describe the motivation or the concrete use case -->
+
+**Please tell us about your environment:**
+<!-- Operating system, IDE, package manager, HTTP server, ... -->
+
+* **@ng-idle version:** 2.x
+<!-- Check whether this is still an issue with the most recent version of @ng-idle/core or add-on module -->
+
+* **Angular version:** 2.x
+<!-- Check whether this is an issue in the most recent Angular version -->
+
+* **Browser:** [all | Chrome XX | Firefox XX | IE XX | Safari XX | Mobile Chrome XX | Android X.X Web Browser | iOS XX Safari | iOS XX UIWebView | iOS XX WKWebView ]
+<!-- All browsers where this could be reproduced -->
+
+* **Language:** [all | TypeScript X.X | ES6/7 | ES5]
+
+* **Node:** `node --version` =

.github/PULL_REQUEST_TEMPLATE.md

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+**Please check if the PR fulfills these requirements**
+- [ ] The commit message follows our guidelines: https://github.com/HackedByChinese/ng2-idle/blob/master/CONTRIBUTING.md#pr
+- [ ] Tests for the changes have been added (for bug fixes / features)
+- [ ] Docs have been added / updated (for bug fixes / features)
+
+
+**What kind of change does this PR introduce?** (check one with "x")
+```
+[ ] Bugfix
+[ ] Feature
+[ ] Code style update (formatting, local variables)
+[ ] Refactoring (no functional changes, no api changes)
+[ ] Build related changes
+[ ] CI related changes
+[ ] Other... Please describe:
+```
+
+**What is the current behavior?** (You can also link to an open issue here)
+
+
+
+**What is the new behavior?**
+
+
+
+**Does this PR introduce a breaking change?** (check one with "x")
+```
+[ ] Yes
+[ ] No
+```
+
+If this PR contains a breaking change, please describe the impact and migration path for existing applications: ...
+
+
+**Other information**: