Add issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+ - A clear and concise description of what the bug is.
+
+**To Reproduce**
+ - Provide reproducible code snippet, please.
+
+**Behavior**
+ - Bug case: provide error traceback, please.
+ - Unexpected behavior case: describe the key points of behavior you face, please.
+
+**Expected behavior**
+ - Provide a clear and concise description of what you expected to happen, please.
+
+**Environment:**
+ - OS: [e.g. Ubuntu-16.04]
+ - Python version: [e.g. 3.7.3]
+ - Package version: [e.g. 0.4.0]
+
+Note: to get package version run `import pkg_resources; pkg_resources.get_distribution('dxfeed').version`
+
+**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 for this project
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+**Describe the feature and the reason for it**
+What functionality you'd like to be added and why. 
+E.g.: Please, add pandas dataframe support to the default handler. It is the most common way to work with tables in python
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen. Expected code snippets are welcome
+
+**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.