GPI-1396 Add issue templates and external links

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: GOG GALAXY 2.0 issue
+    url: https://mantis2.gog.com/
+    about: Report issues related to GOG GALAXY 2.0, official integrations or the whole ecosystem
+  - name: Platform ID request
+    url: https://github.com/gogcom/galaxy-integrations-python-api/issues/160
+    about: Report missing platform id
+  - name: Community integrations
+    url: https://github.com/Mixaill/awesome-gog-galaxy
+    about: Find integrations and their maintainers, request new integrations or report issues related to unofficial integrations.

.github/ISSUE_TEMPLATE/problem_report.md

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+---
+name: API issue
+about: Report a bug or problem with current API architecture
+
+---
+
+**Problem**
+<!-- Describe the problem you faced. -->
+
+**Solution**
+<!-- Describe the solution you'd like. -->
+
+**Alternatives**
+<!-- Optionally describe possible alternatives or current workarounds if any. -->