Fixed typo in readme

[supzi-del]

Issue Number

fixes #148

Describe the changes you've made

changed maim to main on 6th point of the readme

Describe if there is any unusual behaviour of your code(Write NA if there isn't)

NA

Additional context (OPTIONAL)

Add any other context or screenshots about the feature request here.

Test plan (OPTIONAL)

A good test plan should give instructions that someone else can easily follow. How someone can test your code?

Checklist

• [ ] I have added my name in the contributors list at the end of README.md file.
• [x] My code follows the code style of this project.
• [x] My change requires a change to the documentation.
• [x] I have updated the documentation accordingly.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.
• [x] The title of my pull request is a short description of the requested changes.
• [x] Open Source Program names(LGMSOC)