Added findNumOccurrence function

Algorithms.ts

@@ -605,3 +605,17 @@ function swapString(str: string, first: number, second: number): string{
 
 	return tempStr;
 }
+
+//This function returns the number of times the character occurs in the string
+export function findNumOccurrence(str: string, ch: string){
+	let num: number = 0;	//Set the number of occurrences to 0 to start
+	//Loop through every character in the string and compare it to the character passed in
+	for(let strCh of str){
+		//If the character is the same as the one passed in increment the counter
+		if(strCh == ch){
+			++num;
+		}
+	}
+	//Return the number of times the character appeared in the string
+	return num;
+}