build: github acik kaynak hazirligi — LICENSE/CI/topluluk dosyalari eklendi, binary'ler takipten cikarildi, README EN, kok dokumanlar docs/'a tasindi

.github/PULL_REQUEST_TEMPLATE.md

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+## Description
+
+<!-- What does this PR do? What problem does it solve? -->
+
+## Related issue
+
+<!-- Link the issue this PR closes, e.g. Closes #12 -->
+
+## Changes
+
+- [ ] Feature / fix implemented
+- [ ] `flutter test` passes
+- [ ] `flutter analyze` shows no new issues
+- [ ] Changelog updated (if user-facing change)
+
+## Screenshots (if applicable)
+
+<!-- Before/after or new UI -->