Added Sinhalese Translation in courses

[yadhu-vipin]

I have added the neccessary sinhalese translations to the courses / free-courses-si.md

[VanshGarg06]

Hi! I am really eager to contribute to this issue. Please assign this issue to me.

[yadhu-vipin]

i have generated a pull request

[Ajay-singh1]

@yadhu-vipin Can you comment down the pull request number?

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity during last 60 days 😴

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