Adding Github actions for Golang

[gogingersnap777]

Description

Working on testing Github actions but ideally the tests should pass before code is pushed in.

Currently following - https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-go

Changes

• Removed travis.yml and replaced with Github Actions
• Setup up actions to run when there is an PR into master
• Added badge that tells you if the go.yml (go tests) are passing
• Ran go mod tidy

Issue

Issue - https://github.com/tkrajina/golongfuncs/issues/7

[gogingersnap777]

I'm able to get this working in my forked repo but I'm not seeing it pop up in the the main repo (tkrajina/golongfuncs).

[gogingersnap777]

@tkrajina Looking for review whenever you have time!