Add issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve askama
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+What is going wrong?
+
+**To Reproduce**
+Please provide the code showing the bug so it can be reproduced. If possible, a minified version on how to reproduce the bug would be preferred as we would be able to work on it much faster.
+
+**Askama version**
+Which `askama` version are you using?
+
+**Rust version**
+Which `rust` version are using? You can get this information by using `rustc --version`.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest a feature you'd like askama to have
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+Please describe what you'd like to be added. For example:
+ * Missing jinja feature
+ * New syntax
+ * New API
+ * ...