Update README.md

Readme updated with the calculator-cli project in tier-2.

README.md

@@ -83,6 +83,7 @@ required to complete them.
 | --------------------------------------------------------------------------------- | -------------------------------------------------- | -------------- |
 | [Bit Masks](./Projects/2-Intermediate/Bit-Masks-App.md)                           | Using Bit Masks for Conditions                     | 2-Intermediate |
 | [Book Finder App](./Projects/2-Intermediate/Book-Finder-App.md)                   | Search for books by multiple criteria              | 2-Intermediate |
+| [Calculator CLI](./Projects/2-Intermediate/Calculator-CLI.md)                   | Create a basic calculator cli.             | 2-Intermediate |
 | [Card Memory Game](./Projects/2-Intermediate/Card-Memory-Game.md)                 | Memorize and match hidden images                   | 2-Intermediate |
 | [Charity Finder App](./Projects/2-Intermediate/Charity-Finder-App.md)             | Find a Global Charity to donate to                 | 2-Intermediate |
 | [Chrome Theme Extension](./Projects/2-Intermediate/Chrome-Theme-Extension.md)     | Build your own chrome theme extention.             | 2-Intermediate |