Add issue templates. (#1340)

* Add issue template.
* Add config log instruction.

.github/ISSUE_TEMPLATE/bug_template.md

@@ -0,0 +1,50 @@
+---
+name: Bug Report
+about: Create a report to help us improve nDPI
+title: ''
+labels: 'bug'
+assignees: ''
+
+---
+
+
+## Describe the bug
+A clear and concise description of what the bug is.
+
+### Expected behavior
+A clear and concise description of what you expected to happen.
+### Obtained behavior
+A clear and concise description of what happening.
+
+## nDPI Environment (please complete the following information):
+* OS name: [e.g. Ubuntu].
+* OS version: [e.g. 18.04]
+* Architecture: [e.g. arm64]
+* nDPI version or commit hash: [e.g. 4.0-stable or 937357e4bc55610f116f66d15a8e0fc1e260c02c].
+* nDPI compilation flags used: if you are building from source [e.g. --with-pcre --disable-gcrypt].
+* Attach the `config.log` file generated after `./configure` ran (if you are building from source).
+
+## How to reproduce the reported bug
+
+### Reproducible using ndpiReader?
+- [x] The reported bug is reproducible using ndpiReader.
+- [x] The reported bug is not reproducible using ndpiReader.
+
+### If applicable, the used ndpiReader options:
+
+``` shell
+ndpiReader -q -t -i wlo1 -T 20 -U 20
+```
+
+### If your bug is reproducible using a pcap, please attach a pcap file (or a valid link to download it)
+
+Example: test.pcap
+
+### Steps to reproduce the behavior:
+1. Run '...'
+2. Set '....'
+3. Do '....'
+4. See error
+
+## Additional context
+Add any other context about the problem here.