added initial GH template drafts - connect ExpressGateway#380 (ExpressGateway#397)

* added initial GH template drafts

Author: altsang

.github/ISSUE_TEMPLATE.md

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+### Entering Issues
+For enhancements or feature requests, do no enter an issue here, instead please use the [Express Gateway Feathub](https://feathub.com/ExpressGateway/express-gateway), this helps the team prioritize and allows upvoting for everyone.
+
+For all other issues:
+- [ ] please choose a label: `Question` or `Bug`
+- [ ] for `Bug`(s) please include steps to reproduce and any supporting info that might be helpful e.g. `gateway.config.yml`
+
+For `Question`(s) please consider using the [Express Gateway Gitter](https://gitter.im/ExpressGateway/express-gateway) for a real time response instead.

.github/PULL_REQUEST_TEMPLATE.md

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+### Submitting Pull Requests
+We use [Waffle.io](https://waffle.io/ExpressGateway/express-gateway) to track work on the task board. Waffle uses keywords just like Github.
+
+Please see the checklist below and thanks again for your contribution!
+
+- [ ] please use "Connect #<Github Issue>" anywhere within the description
+  - example) "fixes bug with OAuth2 - connect #345" 
+- [ ] branch naming prefix:
+  - bugfix/branch-name (for bugs)
+  - feature/branch-name (for features/enhancments)
+  - doc/branch-name (for docs)
+- [ ] tests
+- [ ] build passes
+- [ ] squash commits and/or rebase