Add vitepress docs

docs/store/basic.md

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+# Basic Utilities
+
+## synced
+Creates a writable store that automatically synchronizes its value with localStorage.
+
+```typescript
+const myStore = synced('storage-key', 'default value');
+```
+
+## getter
+Creates a function that returns the current value of a store without subscribing to it.
+
+```typescript
+const myStore = writable('value');
+const getValue = getter(myStore);
+
+```
+
+## withGetter
+Enhances a store by adding a getter method to access its current value.
+
+```typescript
+const myStore = withGetter(writable('value'));
+console.log(myStore.get()); // 'value'
+```
+
+## throttled
+Creates a store that limits how often subscribers receive updates.
+
+```typescript
+const throttledStore = throttled(1000, myStore); // Updates at most once per second
+```
+
+## custom
+Creates a custom store with optional throttling and custom set behavior.
+
+```typescript
+const customStore = custom(
+  set => {
+    // Setup logic
+    return () => {
+      // Cleanup logic
+    };
+  },
+  { throttle: 1000 }
+);
+```
+
+## adapter
+Creates a derived store that can transform values between two types while maintaining two-way binding.
+
+```typescript
+const adaptedStore = adapter({
+  store: originalStore,
+  forward: (source) => /* transform to target */,
+  backward: (target) => /* transform back to source */
+});
+```
+
+This is particularly useful when you need to transform data structures while maintaining the ability to update the original store.