feat: add Master Admin application functionality

src/app/features/errors/error404/error404.html

@@ -0,0 +1,27 @@
+<div class="page error-bg dark:!bg-bodybg" id="particles-js">
+    <!-- Start::error-page -->
+          <spk-particles id="tsparticles" [options]="particlesOptions" />
+
+    <div class="error-page">
+      <div class="container text-defaulttextcolo dark:text-defaulttextcolor/70r text-defaultsize">
+        <div class="text-center p-5 my-auto">
+          <div class="flex items-center justify-center h-full !text-defaulttextcolor">
+            <div class="xl:col-span-3"></div>
+            <div class="xl:col-span-6 col-span-12">
+              <p class="error-text sm:mb-0 mb-2">404</p>
+              <p class="text-[1.125rem] font-semibold mb-4">Oops 😭,The page you are looking for is not available.</p>
+              <div class="flex justify-center items-center mb-[3rem]">
+                <div class="xl:col-span-6 w-[50%]">
+                  <p class="mb-0 opacity-[0.7]">We are sorry for the inconvenience,The page you are trying to access has
+                    been removed or never been existed.</p>
+                </div>
+              </div>
+              <a routerLink="/dashboards/crm" class="ti-btn bg-primary text-white font-semibold"><i
+                  class="ri-arrow-left-line align-middle inline-block"></i>BACK TO HOME</a>
+            </div>
+            <div class="xl:col-span-3"></div>
+          </div>
+        </div>
+      </div>
+    </div>
+  </div>