Add and test GitHub action to lint all PRs before submission

[palisadoes]

We need to lint all code as part of the pull request process.

1. The commands for the actions file can be found at the beginning of the documentation of this outdated GitHub action
2. We will need the action to be activated only on a pull request. We have an example of how to do that in the Talawa repo
3. Make the action be defined in a file named linter.yml

Test and make sure it doesn't break the code. Try running the linter on the code base as proof.

[XshubhamX]

Can i work on this issue @palisadoes sir

[palisadoes]

@XshubhamX Look at the examples in Talawa There is an action for issues, and another for pull requests.

[XshubhamX]

Ok Sir @palisadoes i will have a look at it.

[Sagar2366]

@XshubhamX what's the progress on this issue ?
This is one of priority item for us. If you are not available please let us know, someone else can take over on this issue.

[XshubhamX]

@Sagar2366 sir I'm currently working on talawa-admin as the whole code of that needs to be converted from vuejs to reactjs sorry sir I won't be able to work on this issue I would have informed earlier.

[yasharth291]

@Sagar2366 sir

[yasharth291]

@Sagar2366 sir amul dhungel has asked to fix it please assign this to him

[mihdas]

Can I try working on this? @palisadoes @Sagar2366.

[mihdas]

Added action to lint, however unable to merge as many js files contain errors

[palisadoes]

@mihdas you will need to lint the entire code base as part of the PR. We had to do the same with Talawa and now things are much better with conflicts.