INTMDB-690: [Terraform] Release.md File with Action Items (#1203)

Author: andreaangiolillo

RELEASING.md

@@ -4,8 +4,33 @@
 
 - [github-changelog-generator](https://github.com/github-changelog-generator/github-changelog-generator)
 
-# Generating the CHANGELOG.md
-Run: 
-```bash 
-github_changelog_generator -u mongodb -p terraform-provider-mongodbatlas --enhancement-label "**Enhancements**" --bugs-label "**Bug Fixes**"
-```
+## Steps
+### Generate the CHANGELOG.md 
+- Run
+
+    ```bash 
+    github_changelog_generator -u mongodb -p terraform-provider-mongodbatlas --enhancement-label "**Enhancements**" --bugs-label "**Bug Fixes**"
+    ```
+-  Open a PR against the release branch
+
+### Pre-release the provider 
+We pre-release the provider to make for testing purpose. **A Pre-release is not published to the Hashicorp Terraform Registry**.
+
+- Open the GitHub repository release page and click draft a new release
+- Fill the pre-release tag and select the correct target branch
+
+    <img width="370" alt="image2" src="https://github.com/mongodb/terraform-provider-mongodbatlas/assets/5663078/e710c0ff-dc00-44c2-9eb6-146cd791d47e">
+
+- Generate Release Notes: Click Generate release notes button to populate release notes
+- Set publishing to Pre-release
+    
+    <img width="477" alt="image3" src="https://github.com/mongodb/terraform-provider-mongodbatlas/assets/5663078/30d2db83-6b2d-4eb2-9da6-93fc34d64c09">
+
+- **There is a bug in the GitHub release page**: after binaries get created, GitHub  flips backthe  status of release as Draft so you have to set it to Pre-Release again.
+
+### Release the provider
+- Follow the same steps in the pre-release but provide the final release tag (example `v1.9.0`). This will trigger the release action that will release the provider to the GitHub Release page. Harshicorp has a process in place that will retrieve the latest release from the GitHub repository and add the binaries to the Hashicorp Terraform Registry.
+- Merge the release branch into master
+- **CDKTF Update**: Once the provider has been released, we need to update the provider version in our CDKTF. Raise a PR against [cdktf/cdktf-repository-manager](https://github.com/cdktf/cdktf-repository-manager).
+  - Example PR: [#183](https://github.com/cdktf/cdktf-repository-manager/pull/183)
+