added README

README.md

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+# Digidecs
+Digidecs is the online form for committee- and board members to submit their receipts.
+
+# Prerequesites
+- [Yarn](https://classic.yarnpkg.com/en/)
+- [Vue](https://vuejs.org/)
+- [Rust](https://www.rust-lang.org/)
+
+# Local Installation
+## start the server
+1. move to the `server` folder
+2. run `cargo build`.
+3. run `cargo run -- --config config.json --dry-run`. if on production, remove the `--dry-run` part.
+
+## start the front-end
+1. Move to the `frontend` folder.
+2. There, run `yarn install`
+3. After this, run `yarn run dev`
+You now have a hot-reloadable dev enviroment. Happy hacking!
+