Added more info to the readme

ref #3

README.md

@@ -1,3 +1,58 @@
 # mailer
 
-Handles mail generation and sending (pw reset, welcome mail, etc)
+Handles mail generation and sending (pw reset, welcome mail, etc)
+
+## Dev Setup 🛠
+> Local dev setup
+
+1. Rename the .env.example file to .env (you can adjust app port and other settings, if needed) or generate a example env with `yarn && yarn test:generate_env`.
+2. Install Dependencies
+   ```bash
+   yarn
+   ```
+3. Start the server
+   ```bash
+   yarn dev
+   ```
+
+
+## Templates
+> The mailer uses html and plaintext templates to generate various mails.
+> The templates are stored in src/templates by default.
+
+We provide a set of default templates that we use for the ["Lauf für Kaya!" charity run](https://lauf-fuer-kaya.de).
+We use handlebars for templateing utilizing i18next for translation - the i18n string format in the templates is : `{{__ "string"}}`
+You can provide your own templates by replacing the ones we provided before compiling the project or by simply mounting your custom templates into the docker container.
+
+The server currently needs the following templates to work:
+* pw-reset.html
+* pw-reset.txt
+* test.html
+* test.txt
+* welcome_runner.html
+* welcome_runner.txt
+
+
+## Recommended Editor
+
+[Visual Studio Code](https://code.visualstudio.com/)
+
+### Recommended Extensions
+
+* will be automatically recommended via ./vscode/extensions.json
+* we also provide a config for i18n-ally in the .vscode folder
+
+## Staging
+### Branches & Tags
+* vX.Y.Z: Release tags created from the main branch
+   * The version numbers follow the semver standard
+   * A new release tag automaticly triggers the release ci pipeline
+* main: Protected "release" branch
+   * The latest tag of the docker image get's build from this
+   * New releases get created as tags from this   
+* dev: Current dev branch for merging the different feature branches and bugfixes
+   * The dev tag of the docker image get's build from this
+   * Only push minor changes to this branch!
+   * To merge a feature branch into this please create a pull request
+* feature/xyz: Feature branches - nameing scheme: `feature/issueid-title`
+* bugfix/xyz: Branches for bugfixes - nameing scheme:`bugfix/issueid-title`