store username and user token in session storage

daily-thought-frontend/src/pages/signIn.tsx

@@ -24,11 +24,11 @@ const SignIn = () => {
     const response = await fetch(endpoint, options)
     const result = await response.json()
 
-    console.log(result.error)
-
     if(result.error !== undefined){
       setError(result.error)
-    } else {  
+    } else {
+      sessionStorage.setItem('username', result.username)
+      sessionStorage.setItem('token', result.token)
       Router.push("/feed")
     }
   }