feat: Implement initial medical simulation

This commit introduces the initial framework for a medical simulation library.

It adds a `Patient` struct to hold vital signs, including:
- Blood Pressure (Systolic and Diastolic)
- Heart Rate
- Respiration Rate
- Body Temperature
- Oxygen Saturation

It also includes:
- An `initializePatient` function to create a patient with baseline healthy vitals.
- A placeholder `updatePatient` function for future simulation logic.
- An updated example to demonstrate the new functionality.

src/MedicalLib.cpp

@@ -10,3 +10,22 @@ double calculateBMI(double weight_kg, double height_m) {
     }
     return weight_kg / (height_m * height_m);
 }
+
+Patient initializePatient(int patientId) {
+    Patient patient;
+    patient.patientId = patientId;
+    patient.bloodPressureSystolic = 120.0;
+    patient.bloodPressureDiastolic = 80.0;
+    patient.heartRate = 75.0;
+    patient.respirationRate = 16.0;
+    patient.bodyTemperature = 37.0;
+    patient.oxygenSaturation = 98.0;
+    return patient;
+}
+
+void updatePatient(Patient& patient, double deltaTime_s) {
+    // For this initial implementation, we will not change the patient's vitals.
+    // This function serves as a placeholder for future, more complex simulation logic.
+    (void)patient;
+    (void)deltaTime_s;
+}