feat: created darkmode composable

Author: Dan0xE

example/styles.less

@@ -121,3 +121,9 @@ body {
     text-overflow: ellipsis;
   }
 }
+
+.dark-textarea {
+  background-color: #333;
+  color: #fff;
+  border-color: #444;
+}

example/useDarkMode.ts

@@ -0,0 +1,19 @@
+import { inject, ref, watch } from 'vue';
+
+export function useDarkMode() {
+  const darkModeState = inject('darkModeState');
+  const localDarkMode = ref(darkModeState.isDarkMode);
+
+  watch(
+    () => darkModeState.isDarkMode,
+    newVal => {
+      localDarkMode.value = newVal;
+    },
+  );
+
+  const toggleLocalDarkMode = () => {
+    darkModeState.isDarkMode = !darkModeState.isDarkMode;
+  };
+
+  return { localDarkMode, toggleLocalDarkMode };
+}