add method and route to search across tracks, albums and artists.

+ break models into separate files
+ same for the utils and setup

app/utils/threading.py

@@ -0,0 +1,13 @@
+import threading
+
+
+def background(func):
+    """
+    a threading decorator
+    use @background above the function you want to run in the background
+    """
+
+    def background_func(*a, **kw):
+        threading.Thread(target=func, args=a, kwargs=kw).start()
+
+    return background_func