GoLang: 3.1.DOC Functions and Packages - Functions

[avishj]

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Description 📜

In this issue, you need to work on the documentation efforts in the "Functions and Packages" section under the "Functions" subsection. Please ensure that you document in detail.

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Domain of Contribution 📊

• [x] Golang

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Instructions ✔

• Kindly make a README going over the subtopic.
• Changes should be made under Golang branch only and push your PR to the same.
• This issue is for GWOC'21 contributors only.
• You need to push in a single commit. If there exists more than one commit then you need to squash your commits into one commit.

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[github-actions[bot]]

Hello @avishj,
Thank you for opening an issue. :octocat:
Check this guide before contributing.