accept strict_slash routes

sanic/router.py

@@ -95,9 +95,15 @@ class Router:
 
         return name, _type, pattern
 
-    def add(self, uri, methods, handler, host=None):
+    def add(self, uri, methods, handler, host=None, strict_slashes=False):
+
         # add regular version
         self._add(uri, methods, handler, host)
+
+        if strict_slashes:
+            return
+
+        # Add versions with and without trailing /
         slash_is_missing = (
             not uri[-1] == '/'
             and not self.routes_all.get(uri + '/', False)