Dinesh101041 issue template

Summary:
**Added a Issue template**

Issue : https://github.com/facebookresearch/d2go/issues/8

Pull Request resolved: https://github.com/facebookresearch/d2go/pull/15

Reviewed By: newstzpz

Differential Revision: D26933233

Pulled By: zhanghang1989

fbshipit-source-id: af4af309fae3432021f15a6aecbbfb62e0c58be2

.github/ISSUE_TEMPLATE/Bugs.md

+---
+name: "\U0001F41B Bugs"
+about: " Report bugs in d2go"
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+## Instructions To Reproduce the 🐛 Bug:
+1. Full runnable code or full changes you made:
+```
+If making changes to the project itself, please use output of the following command:
+git rev-parse HEAD; git diff
+
+<put code or diff here>
+```
+2. What exact command you run:
+3. __Full logs__ or other relevant observations:
+```
+<put logs here>
+```
+4. please simplify the steps as much as possible so they do not require additional resources to run, such as a private dataset.
+
+
+## Expected behavior:
+
+If there are no obvious error in "what you observed" provided above,
+please tell us the expected behavior.

.github/ISSUE_TEMPLATE/Feature-request.md

+---
+name: "\U0001F680Feature Request"
+about: Suggest an improvement or new feature
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+---
+
+## 🚀 Feature
+A clear and concise description of the feature proposal.
+
+## Motivation & Examples
+
+Tell us why the feature is useful.
+
+Describe what the feature would look like, if it is implemented.
+Best demonstrated using **code examples** in addition to words.

.github/ISSUE_TEMPLATE/documentation.md

+---
+name: Documentation
+about: Report a documentation issue
+title: ''
+labels: documentation
+assignees: ''
+---