Standardizing docs between python-slackclient and rtmbot

Added copyright to License File
Added standard format for issues/PRs
Added Code of Conduct
Moved doc/ to docs/

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,29 @@
+* [ ] I've read and understood the [Contributing guidelines](./CONTRIBUTING.md) and have done my best effort to follow them.
+* [ ] I've read and agree to the [Code of Conduct](./CODE_OF_CONDUCT.md).
+* [ ] I've searched for any related issues and avoided creating a duplicate issue.
+
+#### Description
+> e.g. Description of the bug or feature
+
+#### Reproducible in:
+* [ ] This is reproducible in the sample project.
+RTMBot version:
+Python version:
+OS Version:
+
+#### Steps to reproduce:
+
+1. 
+2. 
+3. 
+
+### Expected result:
+> e.g. What you expected to happen
+
+### Actual result:
+> e.g. What actually happened
+
+### Attachments:
+> e.g. Logs, screenshots, screencast, sample project, funny gif, etc.
+
+