Add MAINTAINING.md

commit-id:6fd4f32c

Author: ksew1

MAINTAINING.md

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+# `cairo-coverage` Maintenance
+
+## Release Procedure
+
+To release a new version of `cairo-coverage`, follow these steps:
+
+1. **Prepare a Pull Request (PR)**:
+    - Ensure the correct version is updated in the following files:
+        - `Cargo.toml`
+        - `Cargo.lock`
+        - `CHANGELOG.md`
+    - As a reference, you can check this [PR](https://github.com/software-mansion/cairo-coverage/pull/116/files).
+
+2. **Run the Release Action**:
+    - Trigger the [release workflow](https://github.com/software-mansion/cairo-coverage/actions/workflows/release.yml) from the branch you want to release.
+    - It is recommended to run this from the `main` branch.
+    - Ensure that the commit you are releasing from has passed CI checks, as this is not automatically verified.
+    - The workflow will create a tag, generate a new GitHub release with built binaries, and include the contents of `CHANGELOG.md`.
+
+3. **Announce the Release**:
+    - Notify the community about the update on **Twitter, Telegram, and Discord**.