chore: Update issue templates (#271)

Adding issue template

Author: hiranya911

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,40 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+### [READ] Step 1: Are you in the right place?
+
+  * For issues related to __the code in this repository__ file a Github issue.
+  * For general technical questions, post a question on [StackOverflow](http://stackoverflow.com/)
+    with the firebase tag.
+  * For general Firebase discussion, use the [firebase-talk](https://groups.google.com/forum/#!forum/firebase-talk)
+    google group.
+  * For help troubleshooting your application that does not fall under one
+    of the above categories, reach out to the personalized
+    [Firebase support channel](https://firebase.google.com/support/).
+
+### [REQUIRED] Step 2: Describe your environment
+
+  * Operating System version: _____
+  * Firebase SDK version: _____
+  * Firebase Product: _____ (auth, database, storage, etc)
+  * .NET version: _____
+  * OS: _____
+
+### [REQUIRED] Step 3: Describe the problem
+
+#### Steps to reproduce:
+
+What happened? How can we make the problem occur?
+This could be a description, log/console output, etc.
+
+#### Relevant Code:
+
+```
+// TODO(you): code here to reproduce the problem
+```