Add CMake-focused .gitignore baseline

[Copilot]

The repository had no ignore rules, which left generated CMake build artifacts and CLion build directories eligible for tracking. This change establishes a baseline .gitignore aligned with CMake conventions.

• CMake build artifacts
  • Ignore cache files, generated build outputs, and CMake metadata.
• CLion build directories
  • Document optional ignoring of cmake-build-* directories.

CMakeCache.txt
CMakeFiles
cmake_install.cmake
#cmake-build-*

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com/repos/twxs/vs.language.cmake/issues/comments/3959673875
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

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This section details on the original issue you should resolve

<issue_title>#132 .gitignore</issue_title>
<issue_description>Jerad551/Recieve-Retrieved.Twit-ter-twitter.#132 .gitignore

Originally posted by @Jerad551 in twxs/vs.language.cmake#25 (comment)
</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes #132 .gitignore #1

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