Create Calculator-CLI.md

This is a basic calculator cli. Its main feature is adding multiple integers. Use `-f` flag to add the floating-point. Add only even or odd numbers using the `even` or `odd` sub-command. This cli project covers almost all the basic operations required to build a cli.

Projects/2-Intermediate/Calculator-CLI.md

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+# Calculator CLI
+
+**Tier:** 2-Intermediate
+
+Create a basic calculator with addition feature. 
+
+## User Stories
+
+- [ ] User can add multiple numbers using `add` command.
+- [ ] User can add floating numbers using the `-f` flag.
+- [ ] User can add only even/odd numbers using `even`/`odd` sub-command.
+- [ ] User can use `--help` or `-h` flag to get all the available commands and flags.
+
+> Note: The stories 1 and 2 are basically for static typed language, where passed arguments must be of same type.
+
+## Bonus Features
+
+- [ ] User can use all the basic arithmetic operations like (addition, subtraction, multiplication and divison).
+- [ ] User can use `--help` or `-h` flag to get the sub-commands of command.
+- [ ] **Power of** and **Square Root of** operation.
+
+## Useful links and resources
+
+- [5 keys to create a killer CLI in Go](https://blog.alexellis.io/5-keys-to-a-killer-go-cli/)
+- [How to build a CLI tool in NodeJS ?](https://www.freecodecamp.org/news/how-to-build-a-cli-tool-in-nodejs-bc4f67d898ec/)
+- [Build a Command Line Interface (CLI) Application with Node.js](https://codeburst.io/build-a-command-line-interface-cli-application-with-node-js-59becec90e28)
+- [Building Beautiful Command Line Interfaces with Python](https://codeburst.io/building-beautiful-command-line-interfaces-with-python-26c7e1bb54df)
+- [How to create a CLI in golang with cobra](https://schadokar.dev/posts/how-to-create-a-cli-in-golang-with-cobra/)
+- [Building a Network Command Line Interface in Go](https://tutorialedge.net/golang/building-a-cli-in-go/)
+
+## Example projects
+
+-   [my-calc](https://github.com/schadokar/my-calc)