Add project index, templates, and docs

.github/pull_request_template.md

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+## Add Project to Minecraft Legacy Index
+
+### Project Details
+
+- **Name:** `owner / ProjectName`
+- **URL:** `https://...`
+- **Priority:** `(number)`
+
+### Checklist
+
+- [ ] `projects.json` is valid JSON (no trailing commas, proper quotes)
+- [ ] URL is not already in the list
+- [ ] Project is related to Minecraft Legacy / Console Edition
+- [ ] Only one project added per PR
+
+### Description
+
+<!-- Brief description of the project and why it should be listed -->
+