Added Docker and Docker Compose Installation Instructions For Ubuntu and Linux Users

[abetoluwani]

This pull request introduces a detailed guide for installing Docker and Docker Compose on Ubuntu. The guide covers two installation methods:

1. Using Docker’s Official Repository and GPG Key
2. Using Snap Package Manager

The instructions ensure flexibility for users to choose their preferred method based on system compatibility and package availability. Key components include:

• Adding Docker’s official GPG key and repository.
• Installing Docker packages such as docker-ce, docker-ce-cli, and Docker Compose plugin.
• Downloading and setting up Docker Compose manually.
• Alternative installation of Docker and Docker Compose using Snap or Apt.

Additionally, verification steps are provided to confirm successful installations.

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Changes Introduced

• Added Markdown-formatted instructions for installing Docker and Docker Compose.
• Included multiple installation methods: repository-based, Snap, and direct Apt installation.
• Enhanced clarity with verification commands and alternative approaches.

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How to Test

1. Follow the steps in the guide to install Docker and Docker Compose.
2. Verify installation by running:

   docker --version
   docker-compose --version

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[ersel]

thanks for updating these instructions @abetoluwani