message: Add instructions for local usage of email service
diff: @@ -161,6 +161,30 @@ Run this in a nother console to start the frontend:
  cd app/webFrontend
  npm run start-[docker|vagrant]-dev
  +## Local development settings
  +### E-Mail service
  +When you whish to use the mailing service while developing we recommend using the Debugmail.io service.
  +It acts as an dummy SMTP Server and in it's online "inbox" you see which Mails would have been submitted on an actual SMTP server.
  +a Big advantage is that you dont have to use real (not even valid) addresses and it works just fine with our fixture users.
  +
  +To do so just sign-up at their <a href="https://debugmail.io/sign-up" target="_blank">site</a> create a new project and pass the shown credentials to the API by overwriting the following environmentvariables:
  +```
  + - "MAILPROVIDER=debugmail"
  + - "MAILUSER=yourUsername"
  + - "MAILPASS=someValidPassword"
  +```
  +You don't have to explicitly set the mailprovider when using debugmail since it is the default setting.
  +
  +If you dont wan't to use debugmail you can use any service compatible with the npm package [Nodemailer](https://nodemailer.com/) or just use plain SMTP and set the following variables:
  +```
  + - "MAILSMTPSERVER=smtp.yourserver.domain"
  + - "MAILSMTPPORT=25"
  + - "MAILUSER=yourUsername"
  + - "MAILPASS=someValidPassword"
  +```
  +
  +Manual configuration of smtp server and port will overwrite the settings from mailprovider.
  +
  ## Testing
  To test and lint the api just call:
  