chore: add quadrant program

quadrant/main.cpp

@@ -0,0 +1,24 @@
+#include <iostream>
+using namespace std;
+
+int main(){
+    int x;
+    cin >> x;
+    int y;
+    cin >> y;
+    if (x>0){
+        if (y<0){
+            cout << "4" << endl;
+        }
+        else{
+            cout << "1" << endl;
+        }
+    }
+    else if (y>0){
+            cout << "2" << endl;
+        }
+        else {
+            cout << "3" << endl;
+        }
+    return 0;
+}