GoLang: 9.2.DOC OOP - Composition

Description 📜

Composition Basic-Intermediate-Advanced information about Composition in Golang, also needs to create some examples. Also, need to include Why Composition Instead of Inheritance? This must be inside the Object-Oriented Programming folder.

References:

Domain of Contribution 📊

[x] Golang

Instructions ✔

Kindly make a README going over the subtopic.
Changes should be made under the 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.

Hello @amino19,
Thank you for opening an issue. :octocat:
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This issue has been assigned to @vishnu95075! It will become unassigned if it isn't closed within 12 days. A maintainer can also add the pinned label to prevent it from being unassigned.

This issue has been assigned to @eshan1925! It will become unassigned if it isn't closed within 12 days. A maintainer can also add the pinned label to prevent it from being unassigned.

girlscript / winter-of-contributing