Added a Gaussian noise generator

Tests/IoT-Simulator-CoreTests/IoT_Simulator_CoreTests.swift

@@ -1,6 +1,13 @@
 import Testing
+import RandomCpp
+
 @testable import IoT_Simulator_Core
 
 @Test func example() async throws {
     // Write your test here and use APIs like `#expect(...)` to check expected conditions.
+    var a = GaussianRNG(10, 0.5)
+
+    for _ in 0...10 {
+        print(a.generate())
+    }
 }