Update bootstrap code demo

Update README.md

Update README.md

Update README.md

Added illustration in the readme

Merge branch 'main' of github.com:Lawrence-LUOoo/Bootstrapping-Code-Demonstration

bootsrapping illustraion

Update README.md

Update README.md

Update README.md

Update README.md

Update README.md

getting distribution of r_squared using bootstrapping

Merge branch 'main' of https://github.com/Lawrence-LUOoo/Bootstrapping-Code-Demonstration

Add sampling distribution