added primary content script function

scripts/watchman.js

@@ -0,0 +1,34 @@
+/* Watchman.js 
+Be sensitive to changes and update the state. 
+*/
+
+(async () => {
+    // Import modules. 
+    let secretariat = await import(chrome.runtime.getURL("scripts/secretariat.js"));
+    let reader = await import(chrome.runtime.getURL("scripts/reader.js"));
+
+    class watchman {
+        static observe(URL = window.location.href) {
+            /* Check the current URL. 
+            
+            Parameters: 
+                URL: the page URL; default value is the current webpage
+            Returns: (boolean) status
+            */
+
+            // Create the variable to determine the corresponding key. 
+            let key;
+
+            secretariat.rules(URL);
+
+            return (key);
+        };
+
+        static act() {
+            // TODO
+        };
+    };
+    
+    watchman.observe();
+    watchman.act();
+})();