adds drf-yasg and automated generation of Swagger Schemas (#165)

* adds drf-yasg and automated generation of Swagger Schemas

* swagger url

* swagger docs

* adds swagger url on Readme

* swagger API

* Code of Conduct file

* doc

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Issue report
+about: Create a report to help us improve MediaCMS
+title: ''
+labels: 'issue: bug'
+assignees: mgogoulos
+
+---
+
+**Describe the issue**
+A clear and concise description of what the issue is.
+
+**To Reproduce**
+Steps to reproduce the issue:
+1. Go to ...
+2. Perform action ...
+3. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Environment (please complete the following information):**
+ - OS: [e.g. Ubuntu Linux]
+ - Installation method: [Docker install, or single server install]
+ - Browser, if applicable
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea
+title: ''
+labels: 'issue: enhancement'
+assignees: mgogoulos
+
+---
+
+**Describe the feature you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.