docs: multiply commit types in CONTRIBUTING.md

CONTRIBUTING.md

@@ -48,6 +48,8 @@ This should be one of, in priority order:
 - `feature/` submodule, like `note_graph/note_graph_ui`
 - meaningful short description or a naming for your scope, separated with dashes (`-`), one or a couple of words
 
+---
+
 ## Commit conventions
 
 ### Pull requests
@@ -85,7 +87,9 @@ The format is:
 * This means that this commit introduces a breaking change.
 
 ### `<type>`
+Specify one or more types, separated by commas, to reflect the nature of the changes.
 
+* **Allowed types**:
     * `feat` Commits, that adds a new feature or changes how the old feature works. Should only be user-presented features, changes to logic that does not affect what user of the app sees is `refactor`.
     * `fix` Commits, that fix a bug
     * `refactor` Commits, that rewrite/restructure your code, however does not change any behaviour
@@ -97,6 +101,8 @@ The format is:
     * `ci` Commits, that affect the CI pipeline
     * `chore` Miscellaneous commits e.g. modifying `.gitignore`
     * `revert` Commits that revert other commits
+* **Myltiple Types**:
+    * When a commit involves multiple types, list them separated by commas within `{}` braces.
 
 ### `<scope>`
 
@@ -105,6 +111,11 @@ This should be one of, in priority order:
 - `feature/` module name that you're currently working on
 - meaningful short description or a naming for your scope, separated with dashes (`-`), one or a couple of words
 
+#### **Examples**:
+- (authentication)
+- (feature/note_graph,note_graph_ui)
+- (api,user-management)
+
 ### `<subject>`
 
 * Use the imperative, present tense: "change" not "changed", "add" not "added"
@@ -126,3 +137,41 @@ List of format:
 * Mention closed issues
     - Example: `Closes: #1`
 * Stuff like skip CI for tools like Github Actions
+
+## Examples
+### Single Type Commit
+```ignore
+feat(configuration): add support for environment variables
+
+Allows users to define configuration using environment variables.
+
+Closes: #42
+```
+### Multiple Types Commit
+```ignore
+{build,fix}(deployment): fix Dockerfile and update dependencies
+
+- Fixed a typo in the Dockerfile causing build failures.
+- Updated dependencies to the latest versions.
+
+Closes: #101
+```
+### Single Type Commit
+```ignore
+refactor!(api): change authentication method to OAuth2
+
+Switched from basic authentication to OAuth2 for enhanced security.
+
+BREAKING CHANGE: The authentication method has changed from basic auth to OAuth2. Clients must update their authentication mechanism.
+
+Closes: #202
+```
+### Single Type Commit
+```ignore
+{docs,test}(feature/note_graph,note_graph_ui): add tests and update documentation
+
+- Added unit tests for note graph UI components.
+- Updated the README with new setup instructions.
+
+Related: #303
+```