doc: how to create a new release. (#18)

CREATING_A_RELEASE.md

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+# Creating a release
+
+Only collaborators in npm for **node-api-headers** can create releases. If you
+want to be able to do releases ask one of the existing collaborators to add
+you. If necessary you can ask the build Working Group who manages the Node.js
+npm user to add you if there are no other active collaborators.
+
+## Prerequisites
+
+Before to start creating a new release check if you have installed the following
+tools:
+
+* [Changelog maker](https://www.npmjs.com/package/changelog-maker)
+
+If not please follow the instruction reported in the tool's documentation to
+install it.
+
+## Publish new release
+
+These are the steps to follow to create a new release:
+
+* Open an issue in the **node-api-headers** repo documenting the intent to
+create a new release. Give people some time to comment or suggest PRs that
+should land first.
+
+* Update the version in **package.json** appropriately.
+
+* Update the [README.md][] to show the latest stable version of Node-API.
+
+* Generate the changelog for the new version using **changelog maker** tool.
+From the root folder of the repo launch the following command:
+
+```bash
+> changelog-maker --format=markdown
+```
+
+* Use the output generated by **changelog maker** to update the
+[CHANGELOG.md][] following the style used in publishing the previous release.
+
+* Add any new contributors to the "contributors" section in the
+**package.json**.
+
+* Do a clean checkout of `node-api-headers`.
+
+* Login and then run `npm publish`.
+
+* Create a release in Github (look at existing releases for an example).
+
+* Validate that you can run `npm install node-api-headers` successfully
+and that the correct version is installed.
+
+* Comment on the issue opened in the first step that the release has been created
+and close the issue.
+
+* Tweet that the release has been created.
+
+[README.md]: ./README.md
+[CHANGELOG.md]: ./CHANGELOG.md
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README.md

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 - **[Code of Conduct](CODE_OF_CONDUCT.md)**
 - **[Install](#install)**
 - **[API](#api)**
+- **[Creating a release](CREATING_A_RELEASE.md)**
 - **[Team](#team)**
 - **[License](#license)**