Create Issue and PR Templates (#62)

* create issue template

* create pr template

Author: Sakib Hasan

.github/ISSUE_TEMPLATE.md

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+<!--
+Questions:
+  https://groups.google.com/forum/#!forum/loopbackjs
+  https://gitter.im/strongloop/loopback
+Immediate support:
+  https://strongloop.com/api-connect-faqs/
+  https://strongloop.com/node-js/subscription-plans/
+-->
+
+# Description/Steps to reproduce
+
+<!--
+If feature: A description of the feature
+If bug: Steps to reproduce
+-->
+
+# Link to reproduction sandbox
+
+<!--
+Link to an app sandbox for reproduction
+
+Note: Failure to provide a sandbox application for reproduction purposes will result in the issue being closed.
+-->
+
+# Expected result
+
+<!--
+Also include actual results if bug
+-->
+
+# Additional information
+
+<!--
+Copy+paste the output of these two commands:
+  node -e 'console.log(process.platform, process.arch, process.versions.node)'
+  npm ls --prod --depth 0 | grep loopback
+-->

.github/PULL_REQUEST_TEMPLATE.md

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+### Description
+
+
+#### Related issues
+
+<!--
+Please use the following link syntaxes:
+
+- connect to #49 (to reference issues in the current repository)
+- connect to strongloop/loopback#49 (to reference issues in another repository)
+-->
+
+- connect to <link_to_referenced_issue>
+
+### Checklist
+
+<!--
+- Please mark your choice with an "x" (i.e. [x], see
+https://github.com/blog/1375-task-lists-in-gfm-issues-pulls-comments)
+- PR's without test coverage will be closed.
+-->
+
+- [ ] New tests added or existing tests modified to cover all changes
+- [ ] Code conforms with the [style
+  guide](http://loopback.io/doc/en/contrib/style-guide.html)