Upgraded react-calendar to SPFx 1.16.1

[mohammadamer]

• New sample
• Bug fix/update Node version indicated in .nvmrc file does not work #5233
• Related issues: fixes #X, partially #Y, mentioned in #Z

What's in this Pull Request?

Upgraded to SPFx 1.16.1
Updated README
Small fixes after upgrade to SPFx

Node Version

(Use node -v to get the version of Node you used to build this sample)

Node version used: 16.20.2

Checklist

• [ x] My pull request affects only ONE sample.
• [ x] My sample builds without any warnings
• [ x] I have updated the README.md file's Version history. For new samples, created a new README.md file matching this template
• [ x] My README.md has at least one static high-resolution screenshot (i.e. not a GIF) located in the assets folder.
• [x ] My README.md contains complete setup instructions, including pre-requisites and permissions required
• [x ] My solution includes a .nvmrc file indicating the version of Node.js