feat(modal): add simple modal component with open and close functionality

src/app/shared/components/simple-modal/simple-modal.component.scss

@@ -0,0 +1,19 @@
+.simple-modal {
+  display: grid;
+  gap: 1.5rem;
+  justify-items: center;
+  text-align: center;
+}
+
+.simple-modal__content {
+  margin: 0;
+  color: #666666;
+  line-height: 1.5;
+}
+
+.simple-modal__actions {
+  display: flex;
+  justify-content: center;
+  gap: 0.75rem;
+  flex-wrap: wrap;
+}