docs: add installation prerequisites and quickstart guide to README

tests/oop_test.rc

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+class Animal {
+    int age = 0
+    char * name = null
+
+    constructor(this, char * animalName) {
+        this.age = 0
+        this.name = animalName
+        printf("Animal created: %s\n", this.name)
+    }
+
+    destructor(this) {
+        printf("Animal destroyed: %s\n", this.name)
+    }
+
+    void makeSound(this) {
+        printf("Some generic sound\n")
+    }
+
+    static int getSpeciesCount() {
+        return 42
+    }
+}
+
+class Dog : Animal {
+    int barks = 0
+
+    constructor(this, char * name) {
+        super(name)
+        this.barks = 0
+        printf("Dog created: %s\n", this.name)
+    }
+
+    destructor(this) {
+        printf("Dog destroyed\n")
+    }
+
+    void makeSound(this) {
+        printf("Woof! Woof!\n")
+    }
+
+    void bark(this, int times) {
+        this.barks = this.barks + times
+        printf("Barked %d times\n", times)
+    }
+}
+
+int main() {
+    printf("=== OOP Test ===\n\n")
+
+    printf("Test 1: Create an Animal\n")
+    Animal * animal = new Animal("Generic")
+    animal.makeSound()
+    printf("Animal age: %d\n", animal.age)
+    animal = null
+    printf("\n")
+
+    printf("Test 2: Create a Dog\n")
+    Dog * dog = new Dog("Buddy")
+    dog.makeSound()
+    dog.bark(3)
+    printf("Dog barks: %d\n", dog.barks)
+    dog = null
+    printf("\n")
+
+    printf("Test 3: Static method\n")
+    int count = Animal.getSpeciesCount()
+    printf("Species count: %d\n", count)
+    printf("\n")
+
+    printf("=== OOP Test Complete ===\n")
+    return 0
+}