Create use-resolved-path.mdx (#676)

Co-authored-by: Atila Fassina <atila@fassina.eu>
Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>

Author: 3 people

src/routes/solid-router/reference/primitives/use-resolved-path.mdx

@@ -0,0 +1,37 @@
+---
+title: useResolvedPath
+---
+
+`useResolvedPath` retrieves a signal\<string\>.
+It contains the current resolved path as defined in the Route.
+
+```js
+const path = useResolvedPath(() => '');
+
+// Parent Route path: /user/* 
+console.log(path()); // /user
+
+const path = useResolvedPath(() => 'a/b/c');
+
+// Parent Route path: /user/* 
+console.log(path()); // /user/a/b/c
+
+const path = useResolvedPath(() => '/a/b/c'); // Note: /
+
+// Parent Route path: /user/* 
+console.log(path()); // a/b/c
+```
+
+Useful for making modular routers
+
+```js
+const parentRoutePath = useResolvedPath(() => '');
+
+return <>
+        <h1>Module component layer</h1>
+        <Router base={parentRoutePath()}> // Modular magic
+            <Route path="/" component={() => <div>Index</div>}/>
+            <Route path="/a" component={() => <div>AComponent</div>}/>
+        </Router>
+</>
+```