Admin: How to publish to npm (#107)

This starts our admin section of docs, in .md format

admin/publish.md

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+Docusaurus is published as an npm package that can be installed via `npm` or `yarn`. Here is how you publish the package to npm:
+
+## Log in to npm
+
+Publishing will only work if you are logged into npm with an account with admin rights to the package.
+
+If you are not currently logged into npm locally:
+
+1. `npm adduser`
+1. Enter username, password and associated email address
+
+## Publish
+
+1. Bump version number in `package.json`
+2. `npm publish`
+
+### What version should you use?
+
+The version number should generally increase by some factor than the current one. You can check current version by looking in `package.json`.
+
+```
+"name": "docusaurus",
+"version": "1.0.0-alpha.41",
+"repository": {
+  "type": "git",
+  "url": "https://github.com/facebookexperimental/Docusaurus.git"
+},
+```
+
+For the above example, you may want to bump the version to `1.0.0-alpha.42` or `1.0.0-beta.1` or `1.0.1`.
+
+You can also see the full list of all published versions with `npm show docusaurus versions --json`.