feat: add README

Project/README.md

@@ -0,0 +1,48 @@
+# MailChecker  
+
+## Requirement  
+- swipl: SWI-Prolog version 9.2.3 for x86_64-linux  
+- npm: 10.5.2  
+- nodejs: v18.18.2  
+
+## How to run it  
+``` shell  
+npm install
+npm start
+```
+then visit localhost:3000
+
+## Example input
+```
+google.com
+renge.io
+gmail.com
+outlook.com
+cs.stonybrook.edu
+```
+
+## Expected result
+```
+a:
+[
+    "1.1.1.1" //list of IPs the input domain pointed to
+]
+mx:
+[
+    //list of mx domain and priority that the domain points to
+    {
+        "exchange": "example.com",
+        "priority": 10
+    }
+]
+spf:
+{
+    "spf": "v=spf1 mx -all", //spf record of the domain
+    "allowedIP4": [
+        "1.1.1.1" //lists of ipv4 ips that is allowed to send email from this domain
+    ],
+    "allowedIP6": [
+        "2001:4860:4000::/36" //lists of ipv6 ips that is allowed to send email from this domain
+    ]
+}
+```

Project/public/index.html

@@ -37,6 +37,14 @@
                 console.error('ERROR:', error);
             }
         }
+
+        // Add event listener for Enter key press
+        document.getElementById("inputText").addEventListener("keyup", function(event) {
+            if (event.key === "Enter") {
+                event.preventDefault();
+                sendGetRequest();
+            }
+        });
     </script>
 </body>
 </html>