CI/CD files

[braindef]

I was bored so I updated my fork from your repo (at about 19:00). The difference is now only the CI/CD files.

• You can easily add your project to Travis by clicking on "Sign Up" on https://travis-ci.org/ (dont confuse with .com, thats the commercial one) and then create an travis account with your github account.
  (this will add a plugin to your user-settings in github)

• then you need to go to https://travis-ci.org/account/repositories / or just click on settings and enable the repository jamulus, travis will list all your repos.
  (this will adds a webhook to your project that triggers the build on travis.org if changed, you can manage (delete) the hook in repository-settings on github)

• and then travis should test the buildprocess defined in .travis-ci.yml each time when you update your repo (for windows, osx and linux), and if you also add the 2 lines in README.md then it adds a nice green or red button after compiled. Warning, normally the browser caches this svg image, so you need to press CTRL-F5 that it becomes green.
  (remember to change the https://api.travis-ci.org/braindef/jamulus.svg?branch=master to https://api.travis-ci.org/corrados/jamulus.svg?branch=master in your repo)

with kind regards
Marc

[corrados]

Thank you, Marc, for you work!