docs(release): note down how to release stuff for npm

docs/release.md

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+# Release process
+
+because I always forget how this stuff works
+
+## First development snapshot
+
+1. `npm version premajor|preminor|prepatch --preid=alpha` - increases the major|minor|patch version with a `-alpha.0` postfix
+2. `git push --follow-tags`
+3. `npm publish --tag alpha.0`
+
+## Second and later development snapshots
+
+1. `npm version prerelease --preid=alpha` - increases the number only in the `-alpha.0` postfix [1]
+2. `git push --follow-tags`
+3. `npm publish --tag alpha.0` <-- replace the `0` with the number you got from `npm version` in step 1
+
+Tip: the current version can be printed out with this command: `node -p "require('./package.json').version"` [2]
+
+## Installing a snapshot version
+
+`npm i [email protected]`
+
+## Release
+
+1. `npm version major|minor|patch` - similarly to how it was done in the first development snapshot
+2. `git push --follow-tags`
+3. `npm publish`
+4. Go to github and create a new release
+
+## Sources
+
+- [1] https://stackoverflow.com/a/51888437/1806628
+- [2] https://stackoverflow.com/a/33628871/1806628