docs(husky): Explain npm prepare script

Author: thomasv

package.json.md

@@ -0,0 +1,10 @@
+# [package.json](https://docs.npmjs.com/cli/v7/configuring-npm/package-json)
+
+> This document serves as a replacement for comments in `package.json`, since it includes a lot of configuration often
+> requiring explanation.
+
+- [scripts](https://docs.npmjs.com/cli/v7/configuring-npm/package-json#scripts)
+    - `prepare` Installs git hooks with husky. If install fails, it omits npm error
+      (i.e. when installed with `npm install --omit=dev` and husky can not be found)
+      through husky's suggested disabled ci settings
+      (see: [disable husky with custom script](https://typicode.github.io/husky/#/?id=with-a-custom-script)).