Add basic CI Release Documentation

.github/workflows/README.md

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+# CI
+
+The CI must be updated whenever there is a new release
+
+### How to create new CI for release
+
+#### Make new scheduled CI for release branch
+**1. create new CI file in `.github/workflows` named `ci-<release_version>` in the master branch**
+
+**2. copy the workflow in the `ci-release-TEMPLATE` file over to the `ci-<release_version>` file**
+
+**3. rename the `name` attribute at the top of the file to `CI <release_version>`**
+
+**4. Fill in the checkout action placeholder, use `with: release-<branch-name>` for checkout action**
+
+**5. Uncomment the `schedule` trigger. It's also fine to delete the `pull-request` trigger, that will be handled in the next step**
+
+###backport CI to release branch**
+
+**1. create new CI file in `.github/workflows` named `ci-<release_version>` in the master branch**
+
+**2. copy the workflow in the `ci-release-TEMPLATE` file over to the `ci-<release_version>` file**
+
+**3. rename the `name` attribute at the top of the file to `CI <release_version>`**
+
+**4. Fill in the checkout action placeholder, use `with: fetch-depth: 0` for checkout action**
+
+**5. When creating a release branch, delete all the branch's CI files and add the new ci file.**