Added my problem and solution

Beginner Level 📁/Calculator/question.md

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+Create a calculator in the language Typescript that includes the following calculations:
+
+- Adding
+- Subtracting
+- Multiplying
+- Dividing
+- Squaring
+- Cubing
+- Find square root
+- Find cube root

Beginner Level 📁/Calculator/solution.ts

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+class Calculator {
+    input: number;
+    constructor(input:number){
+        this.input = input;
+    }
+
+    addNumber(num:number){
+        return this.input + num;
+    }
+    subtractNumber(num:number){
+        return this.input - num;
+    }
+    multiplyNumber(num:number){
+        return this.input * num;
+    }
+    divideNumber(num:number){
+        return this.input / num;
+    }
+    squareNumber(){
+        return this.input * this.input;
+    }
+    cubeNumber(){
+        return this.input * this.input * this.input;
+    }
+    findSqRoot(){
+        return Math.sqrt(this.input);
+    }
+    findCubeRoot(){
+        return Math.cbrt(this.input);
+    }
+
+}
+
+let myCalc = new Calculator(125);
+console.log(myCalc.findCubeRoot());