diff --git a/index.js b/index.js
new file mode 100644
index 0000000..a61691a
--- /dev/null
+++ b/index.js
@@ -0,0 +1,73 @@
+class IdmQuantityPicker{
+  constructor({selector , min = 1, max = 99}) {
+    const container = document.querySelector(selector);
+    if(!container){
+      console.error("IdmQuantityPicker: container not found.");
+      return;
+    }
+    
+    const input = this.container.querySelector(".idm-quantity-picker__input");
+    if(!input){
+      console.error("IdmQuantityPicker: input not found");
+      return;
+    }
+    
+    this.container=container;
+    this.input = input;
+    this.min = min;
+    this.max = max;
+    this._value = Number.parseInt(input.value);
+    
+    this.init();
+  }
+  
+  
+  updateInput(){
+    this.input.value = this._value;
+  }
+  
+  // unused
+  get value() {
+    return this._value;
+  }
+  
+  set value(newValue) {
+    if (newValue < this.min || newValue > this.max) return;
+    
+    this._value = newValue;
+    this.updateInput();
+  }
+  
+  handlePlus(){
+    this.value++;
+    
+  }
+  
+  handleMinus(){
+    console.log("minus");
+    this.value--;
+  }
+  
+  initEvents(){
+    const minusButton = this.container.querySelector(".idm-quantity-picker__minus");
+    const plusButton = this.container.querySelector(".idm-quantity-picker__plus");
+    
+    if(!minusButton){
+      console.error("IdmQuantityPicker: minus button not found.");
+      return;
+    }
+    
+    if(!plusButton){
+      console.error("IdmQuantityPicker: plus button not found.");
+      return;
+    }
+    
+    minusButton.addEventListener("click", () => this.handleMinus());
+    plusButton.addEventListener("click", () => this.handlePlus());
+  }
+  
+  init(){
+    console.log("IdmQuantityPicker: init.");
+    this.initEvents();
+  }
+}
\ No newline at end of file