Create ISSUE_TEMPLATE.md

.github/ISSUE_TEMPLATE.md

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+### Python version
+
+```bash
+$ python --version
+```
+
+``<INPUT PYTHON VERSION>``
+
+### cChardet version
+
+```python
+import cchardet
+print(cchardet.__version__)
+```
+
+``<INPUT CCHARDET VERSION>``
+
+### What is the problem?
+
+#### Expected behavior
+
+#### Actual behavior
+
+#### Steps to reproduce the behavior