1. change codes in local repository

• new file named "README.md"
• save file in "MathTool" directory

2. Commit to git

• git add .
• git commit -m "Create README.md"

It is not applied to remote repository yet.

So, how to apply to remote repository?

you need to "PUSH" it.

3. push to remote repository

• git push

4. check on GitHub page

The reason "README.md" is shown is when the file name is "README", GitHub shows it directly.

usually people write the important informations in README file.