replace python django backend with nodejs backend

backend/README.md

@@ -1,5 +1,32 @@
-Run dev env: `./dev.sh`
+# Vampire backend
 
-Migrate `python manage.py migrate`
+## Development
 
-Make migration `python manage.py makemigrations --name <name> ai`
+### Setup
+Run `npm i`
+
+### Configuration
+The configuration can be found in the `config` directory. To override the defaults
+in the `config.json`, copy the `config.json` and give it the name `config.dev.json`.
+Both configs will be merged where the values of the `config.dev.json` take precedence.
+Values that are not overridden/absent in the `config.dev.json` will use the values from
+the `config.json`.
+
+### Running
+Run `npm run dev`. On windows run `npm run dev-win`.
+This will start a node server that automatically reboots when the code is changed. 
+
+### Creating database migrations
+Run `npm run migrate:make`. This will create new migration in the `migrations` directory.
+Then, rename the migration to a meaningful name but keep the date in the name.
+Also, have a look the existing migrations and code your migration in the same manner.
+Finally, register the migration in the `migrations/_migrations.ts` file.
+
+### Testing
+Run `npm run test`. The backend uses `jest` as the testing framework.
+
+### OpenApi specs
+The backend automatically generates an open api spec. All models will automatically 
+to the spec along with all endpoints. However, the endpoints will have the parameters 
+and responses missing due to the limitations in the openapi-generator package. Those need
+to be filled manually.