Added Circular Arc Problem

Author: paternostrox

L-B/0023 CircularArc (L-B)/CircularArc.js

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+function CircularArc(r, theta) {
+    let thetaRad = theta * (Math.PI / 180); 
+    return thetaRad * r;
+}
+
+CircularArc(10, 45); // Change these numbers

L-B/0023 CircularArc (L-B)/README.md

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+# CircularArc
+
+## Problem
+Write a function that takes a radius 'r' and a angle 'theta' in DEGREES and returns the length of the circular arc.
+
+## Solution
+
+```javascript
+function CircularArc(r, theta) {
+  let thetaRad = theta * (Math.PI / 180); 
+  return thetaRad * r;
+}
+```
+
+## How it works
+- First we convert the angle from degrees to radians.
+- Then we calculate the arc based on the angle in radians using the arc formula.
+
+
+## References
+- [Wikipedia](https://en.wikipedia.org/wiki/Circular_arc)
+- [GoLinuxCloud](https://www.golinuxcloud.com/mathtoradians-javascript/)
+
+## Problem Added By
+Same as reference, use your any social links
+- [GitHub](https://github.com/paternostrox) 
+- [LinkedIn](https://www.linkedin.com/in/paternostrox)
+
+
+## Contributing
+Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.
+
+Please make sure to update tests as appropriate.