feat: adds Bryana's code samples (#162)

Author: bryanasb251

lesson_04/Bryana Singleton-Barnhart/README.md

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+## Swift implementation
+
+```Swift
+func isPrime(_ num: Int) -> Bool {
+    if num < 2 { return false }
+    if num == 2 { return true }
+    if num % 2 == 0 { return false } // Eliminate even numbers
+
+    for i in 3...Int(Double(num).squareRoot()) where i % 2 != 0 {
+        if num % i == 0 {
+            return false
+        }
+    }
+    return true
+}
+```
+
+## C++ implementation
+
+```C++
+#include <iostream>
+#include <cmath>
+
+bool isPrime(int num) {
+    if (num < 2) return false;
+    if (num == 2) return true;
+    if (num % 2 == 0) return false; // Eliminate even numbers
+
+    for (int i = 3; i <= sqrt(num); i += 2) { // Check only odd numbers
+        if (num % i == 0) {
+            return false;
+        }
+    }
+    return true;
+}
+```
+
+## Explanation
+Some of the observations I've made are that both code implementations had an `isPrime` function.
+
+For both, if the number is less than 2 it returns false (`if num < 2 { return false }`). If the number is even to 2 it returns true (`if num == 2 { return true }`). If the number is divided by 2 and equals 0 it returns false ( `if num % 2 == 0 { return false }`).
+
+I noticed both languages have `bool` in code but in different spaces.
+
+Swift and C++ have the same loop variable (i)
+
+Both codes include If (`num % i == 0`). Taking the number divided by `i = 0`.
+
+### Differences
+
+In C++ the code starts off with `#include <iostream> #include <cmath>`. 
+
+Before the function `isPrime` Swift starts with `func` but C++ starts with `bool`.
+
+Even though both codes have square root it is formatted differently (`.squareRoot()` and `sqrt()`) in the code.
+
+Swift has `Double(num)` in the code where C++ does not include this.
+
+In Swift the code does not declare the `i` but C++ declares the `i`.
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