docs: add quick-start.md for SolidJS (#48)

Updated the SolidJS quick start which follows the example shown for React, Vue, and Angular.

docs/framework/solid/quick-start.md

@@ -3,4 +3,57 @@ title: Quick Start
 id: quick-start
 ---
 
-# TODO
+The basic Solid app example to get started with the Tanstack Solid-store.
+
+```jsx
+import { useStore, Store } from '@tanstack/solid-store';
+
+export const store = new Store({
+  cats: 0,
+  dogs: 0
+})
+
+export const Display = (props) => {
+  const count = useStore(store, (state) => state[props.animals]);
+  return (
+    <span>
+      {props.animals}: {count()}
+      </span>
+    );
+}
+
+export const Button = (props) => {
+  return (
+    <button
+      onClick={() => {
+        store.setState((state) => {
+          return {
+            ...state,
+            [props.animals]: state[props.animals] + 1
+          }
+        })
+      }}
+    >
+      Increment
+    </button>
+  )
+}
+
+const App = () => {
+  return (
+    <div>
+    <h1>How many of your friends like cats or dogs?</h1>
+    <p>
+      Press one of the buttons to add a counter of how many of your friends
+      like cats or dogs
+      </p>
+      <Button animals="dogs" />
+      <Display animals="dogs" />
+      <Button animals="cats" />
+      <Display animals="cats" />
+  </div>
+  );
+};
+
+export default App;
+```