docs: add installation prerequisites and quickstart guide to README

tests/oop_simple_test.rc

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+class Point {
+    int x = 0
+    int y = 0
+
+    void print(this) {
+        printf("Point(%d, %d)\n", this.x, this.y)
+    }
+
+    int getX(this) {
+        return this.x
+    }
+
+    int getY(this) {
+        return this.y
+    }
+}
+
+int main() {
+    printf("=== Simple OOP Test ===\n\n")
+
+    printf("Test 1: Create object\n")
+    Point * p = new Point()
+    printf("Created point\n")
+
+    printf("Test 2: Access fields\n")
+    printf("p.x = %d\n", p.x)
+    printf("p.y = %d\n", p.y)
+
+    printf("Test 3: Call method\n")
+    p.print()
+
+    printf("Test 4: Call getter methods\n")
+    int px = p.getX()
+    int py = p.getY()
+    printf("Got x=%d, y=%d\n", px, py)
+
+    printf("\n=== Test Complete ===\n")
+    return 0
+}