docs: add Visit our Blog and Join our Discord badges to README

[Zach Hooper (XBOX) (zachhooper)]

Summary

Branch readme-blog-discord-badges. Adds two badges to the README badge row, between the Documentation on Microsoft Learn badge and the PRs welcome badge:

• Visit our Blog -> https://developer.microsoft.com/en-us/games/articles/
• Join us on Discord -> https://aka.ms/msftgamedevdiscord

Badge iconography and colors match microsoft/godot-csharp-essentials (rss logo / FFA500 for the blog, discord logo / 7289DA for Discord). Only the Discord link target differs, pointing at the Microsoft game dev Discord aka.ms link as requested. Definitions follow the existing reference-style [badge-*] / [link-*] convention at the bottom of the README.

Public API changes

None.

# No API surface touched by this change.

Spec / docs / samples updated

• spec\gdext-<feature>.md updated (Plan / Progress sections if multi-session work)
• docs\godot-<addon>-*.md updated
• addons\<addon>\doc_classes\*.xml updated for any public API change
• Sample content (sample\<host>\) updated when public addon behaviour changed
• Path-scoped instruction file (.github\instructions\<addon>.instructions.md) updated if conventions changed
• Not applicable - no public addon behaviour changed

Root README.md is the only file touched.

Test coverage delta

• Contract (offline) tests added/removed: none
• Live-read tests added/removed: none
• Live-write tests added/removed: none
• Live title id used (if any): none

Validation run

Markdown-only change - no .gd, .cpp, or build files touched, so the parse gate and test orchestrator were intentionally not run (nothing they cover appears in this diff). pr-gates.yml path filters also skip pure **.md churn. Validation performed instead was link/asset reachability:

# HTTP checks (Invoke-WebRequest, redirects followed)
https://img.shields.io/badge/Visit%20our-Blog-FFA500?logo=rss&logoColor=white           -> 200
https://img.shields.io/badge/Join%20us%20on-Discord-7289DA?logo=discord&logoColor=white -> 200
https://developer.microsoft.com/en-us/games/articles/                                   -> 200
https://aka.ms/msftgamedevdiscord                                                       -> 200

Live tests: skipped (default). -AllowLiveWrites was not used.

Migration notes

None.

[Copilot]

Pull request overview

Adds two new Shields.io badges to the README’s top badge row to promote the Microsoft Game Dev blog and the Microsoft Game Dev Discord, following the existing reference-style badge/link definition pattern used in this repo.

Changes:

• Add “Visit our Blog” badge linking to the Microsoft Game Dev articles page.
• Add “Join us on Discord” badge linking to https://aka.ms/msftgamedevdiscord.
• Add corresponding [badge-*] / [link-*] reference definitions at the bottom of README.md.

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[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated no new comments.