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Create the first unix example

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	`1`	`+# Basic Calculator (TUI)`
	`2`	`+`
	`3`	`+## Compile:`
	`4`	+Use the `m̀ake` command to compile
	`5`	`+`
	`6`	`+## Usage`
	`7`	+You have 4 operatios `plus` `minus` `times` `devide`
	`8`	`+`
	`9`	+```
	`10`	`+# The hardest math problem.`
	`11`	`+./calculator 6 times 3`
	`12`	+```
	`13`	`+`
	`14`	+the output should be a simple `18`
	`15`	`+`

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	`1`	`+#include <iostream>`
	`2`	`+#include <string>`
	`3`	`+#include <sstream>`
	`4`	`+`
	`5`	`+// Parse Float`
	`6`	`+float parseFloat( const std::string &str ) {`
	`7`	`+`
	`8`	`+ std::stringstream ss(str);`
	`9`	`+ float num;`
	`10`	`+ ss >> num;`
	`11`	`+ return num;`
	`12`	`+`
	`13`	`+}`
	`14`	`+`
	`15`	`+`
	`16`	`+int main( int argc, char** argv ) {`
	`17`	`+`
	`18`	`+ const std::string Operation(argv[2]); // take the second argument before the "./calculator"`
	`19`	`+`
	`20`	`+ if (Operation == "plus") std::cout << parseFloat(argv[1]) + parseFloat(argv[3]) << '\n'; // Plus`
	`21`	`+ else if (Operation == "minus") std::cout << parseFloat(argv[1]) - parseFloat(argv[3]) << '\n'; // Minus`
	`22`	`+ else if (Operation == "times") std::cout << parseFloat(argv[1]) * parseFloat(argv[3]) << '\n'; // Times`
	`23`	`+ else if (Operation == "divide") std::cout << parseFloat(argv[1]) / parseFloat(argv[3]) << '\n'; // Divide`
	`24`	`+ else std::cout << "Invalid operation\n"; // Invalid operation message`
	`25`	`+`
	`26`	`+ return 0;`
	`27`	`+`
	`28`	`+}`

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