docs: add readme documentation

README.md

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+[![Commitizen friendly](https://img.shields.io/badge/commitizen-friendly-brightgreen.svg)](http://commitizen.github.io/cz-cli/)
+
+# mol-conventional-changelog
+
+
+## Setup
+
+Install commitizen version 2.8.2
+
+```
+npm install -g [email protected]
+```
+
+Install the `mol-conventional-changelog` package.
+
+```
+npm install --save-dev mol-conventional-changelog
+```
+
+Init committizen configuration
+
+```
+commitizen init rb-conventional-changelog --save-dev --save-exact
+```
+
+## Usage
+
+```
+git cz
+```
+
+#### Examples
+
+```
+feat: add 'graphiteWidth' option
+```
+
+```
+fix: stop graphite breaking when width < 0.1
+```
+
+```
+perf: remove graphiteWidth option
+
+BREAKING CHANGE: The graphiteWidth option has been removed. The default graphite width of 10mm is always used for performance reason.
+
+Issues: MOL-1234
+```
+
+### Commit Message Format
+
+* A commit message consists of a **header**, **body** and **footer**.
+* The header has a **type** and a **subject**:
+
+```
+{{type}}: {{subject}}
+<BLANK LINE>
+{{body}}
+<BLANK LINE>
+{{breaking changes}}
+<BLANK LINE>
+{{footer}}
+```
+
+The **header** is the only mandatory part of the commit message.
+
+The first line (type + subject) is limited to 50 characters **[enforced]**
+Any other line should be limited to 72 character **[automatic wrapping]**
+
+This allows the message to be easier to read on GitHub as well as in various git tools.
+
+### Type
+
+Must be one of the following:
+
+* `feat`: A new feature.
+* `fix`: A bug fix.
+* `docs`: Documentation only changes.
+* `style`: Changes that do not affect the meaning of the code (white-space, formatting, missing semi-colons, etc).
+* `refactor`: A code change that neither fixes a bug or adds a feature.
+* `perf`: A code change that improves performance.
+* `test`: Adding or updating tests.
+* `chore`: Changes to the build process or auxiliary tools and libraries such as documentation generation and linters.
+
+### Subject
+
+The subject contains succinct description of the change:
+
+* Use the imperative, present tense: "change" not "changed" nor "changes"
+* Lowercase only **[automatic fix]**
+* No dot (.) at the end.
+
+### Body
+
+Just as in the **subject**, use the imperative, present tense: "change" not "changed" nor "changes".
+The body should include the motivation for the change and contrast this with previous behavior.
+
+### Breaking Changes
+
+**Breaking Changes** must start with the words `BREAKING CHANGE: `.
+
+### Footer
+
+The footer is the place to reference any tasks related to this commit.