Create Tag tables and Add Tag endpoint

src/database/schema.rs

@@ -6,6 +6,21 @@ table! {
     }
 }
 
+table! {
+    tagged_photo (id) {
+        id -> Integer,
+        photo_name -> Text,
+        tag_id -> Integer,
+    }
+}
+
+table! {
+    tags (id) {
+        id -> Integer,
+        name -> Text,
+    }
+}
+
 table! {
     users (id) {
         id -> Integer,
@@ -14,4 +29,11 @@ table! {
     }
 }
 
-allow_tables_to_appear_in_same_query!(favorites, users,);
+joinable!(tagged_photo -> tags (tag_id));
+
+allow_tables_to_appear_in_same_query!(
+    favorites,
+    tagged_photo,
+    tags,
+    users,
+);