Addition of Github Actions to automate workflows

[abhushanaj]

Add appropriate actions to do the following tasks:

• Give a message when creating an issue.
• Give a message when creating a PR to project.
• Actions to detect stale issues and PR and give labels to them. ( Issue and PR which are unattended for long time)
• Auto Assign reviewers to PR created so they get notified about them.
• Detect any foul language/behaviour.

@plxity @yellowwoods12 Do you think it's a good idea to add these to the repo??

[yellowwoods12]

@abhu-A-J Not the first two since we already get notification for that on the slack channel.

[abhushanaj]

@abhu-A-J Not the first two since we already get notification for that on the slack channel.

@yellowwoods12 Ma'am when I say message on PR or issue. I actually meant give greetings message to contestants on Github. I should have written it better. LOL! So shall I include that??