add link md file code example

Example 1: how to create link in readme.md

[a link] (https://github.com/user/repo/blob/branch/other_file.md)

Example 2: markdown image

![GitHub Logo](/images/logo.png)
Format: ![Alt Text](url)

Example 3: Markdown image

![Text here](URL)

Example 4: add link in md

[link to google](https://www.google.com)