added issue templates, mostly copied from elastic/apm-agent-nodejs (#350)

closes #350

Author: beniwohli

.github/ISSUE_TEMPLATE/Bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+
+---
+
+**Describe the bug**: ...
+
+**To Reproduce**
+
+1. ...
+2. ...
+3. ...
+4. ...
+
+**Expected behavior**: ...
+
+**Environment (please complete the following information)**
+- OS: [e.g. Linux]
+- Python version:
+- Framework and version [e.g. Django 2.1]: 
+- APM Server version:
+- Agent version:
+
+
+**Additional context**
+
+Add any other context about the problem here.
+
+- Agent config options <!-- be careful not to post sensitive information -->
+  <details>
+    <summary>Click to expand</summary>
+
+    ```
+    replace this line with your agent config options
+    remember to mask any sensitive fields like tokens
+    ```
+  </details>
+- `requirements.txt`:
+  <details>
+    <summary>Click to expand</summary>
+
+    ```
+    replace this line with your `requirements.txt`
+    ```
+  </details>

.github/ISSUE_TEMPLATE/Feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution 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.