docs(shortcuts): add config details (#155)

docs/content/1.getting-started/4.shortcuts.md

@@ -48,6 +48,65 @@ defineShortcuts({
 </script>
 ```
 
+### `usingInput`
+
+Prop: `usingInput?: string | boolean`
+
+By default, `usingInput` is `false`, meaning it will only trigger when no input is focused. When set to `true`, the shortcut will also trigger when any input is focused.
+
+For a more advanced behavior, `usingInput` can be set to the name of an input, so it only triggers when focusing this specific input.
+
+```vue
+<template>
+  <UInput v-model="query" name="queryInput" />
+</template>
+
+<script setup lang="ts">
+const query = ref('')
+
+defineShortcuts({
+  enter: {
+    usingInput: 'queryInput',
+    handler: () => {
+      // TODO
+    }
+  }
+})
+</script>
+```
+_`enter` shortcut will only trigger when `queryInput` is focused._
+
+### `whenever`
+
+Prop: `whenever?: WatchSource<Boolean>[]`
+
+`whenever` allows to add constraints on the shortcut triggering behavior. This array can contain `Ref<Boolean>`, `ComputedRef<Boolean>` or `() => Boolean`.
+
+```ts
+defineShortcuts({
+  meta_k: {
+    usingInput: true,
+    handler: () => { isOpen.value = !isOpen.value }
+  },
+  escape: {
+    usingInput: true,
+    whenever: [isOpen],
+    handler: () => { isOpen.value = false }
+  }
+})
+```
+_`escape` shortcut will only trigger when `isOpen` is `true`._
+
+### Simple shortcut
+
+In case the shortcut does not need any config, it can be written as a function.
+
+```ts
+defineShortcuts({
+  '?': () => openHelpModal()
+})
+```
+
 ## `useShortcuts`
 
 To display shortcuts in your app according to the user's OS, you can use the `useShortcuts` composable.
@@ -61,3 +120,4 @@ const { metaSymbol } = useShortcuts()
   <UKbd>{{ metaSymbol }}</UKbd>
 </template>
 ```
+_`metaSymbol` will display either `⌘` on MacOS or `Ctrl` on any other OS_