Create feature_request.md

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest a new feature
+title: "[FEAT] "
+labels: enhancement
+assignees: ''
+
+---
+
+**Describe the feature you'd like to be added to Parquet Viewer**
+Provide as much detail as possible.
+
+**Share why this feature would be a good addition to the utility**
+Will it improve usability, reliability or some other aspect?
+
+**Screenshots**
+Any screenshots describing how the feature would look is a plus.
+
+Note: There are no guarantees your feature will be implemented.