GoLang: 2.3.DOC Variables, Types & Constants - Constants

[avishj]

---

Description 📜

In this issue, you need to work on the documentation efforts in the "Variables, Types & Constants" section under the "Constants" subsection. Please ensure that you document in detail.

---

Domain of Contribution 📊

• [x] Golang

---

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.

---

[github-actions[bot]]

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