Add local development to README

README.md

@@ -8,8 +8,6 @@
 
 [Keyoxide](https://keyoxide.org) is a modern, secure and decentralized platform to prove your online identity.
 
-
-
 ## Self-hosting
 
 Self-hosting Keyoxide is an important aspect of the project. Users need to trust the Keyoxide instance they're using to reliably verify identities. Making Keyoxide itself decentralized means no one needs to trust a central server. If a friend or family member is hosting a Keyoxide instance, it becomes much easier to trust the instance!
@@ -52,3 +50,14 @@ Contributing to Keyoxide can happen in many forms:
 - Promoting decentralized identity and web3.0
 
 Please note that this project has a [Code of Conduct](https://codeberg.org/keyoxide/web/src/branch/main/CODE_OF_CONDUCT.md) that all contributors agree to abide when participating.
+
+### Local development
+
+To run Keyoxide locally on your machine for development:
+
+- install NodeJS
+  - directly from their [website](https://nodejs.org/en/), or
+  - using [nvm](https://github.com/nvm-sh/nvm): `nvm install --lts; nvm use --lts`
+- run the server with `node index.js`
+
+Keyoxide will now be available at [https://localhost:3000](https://localhost:3000)