Create Tag tables and Add Tag endpoint

migrations/2021-09-02-000740_create_tags/down.sql

@@ -0,0 +1,3 @@
+DROP TABLE tags;
+DROP TABLE tagged_photo;
+

migrations/2021-09-02-000740_create_tags/up.sql

@@ -0,0 +1,11 @@
+CREATE TABLE tags (
+    id INTEGER PRIMARY KEY NOT NULL,
+    name TEXT NOT NULL
+);
+
+CREATE TABLE tagged_photo (
+    id INTEGER PRIMARY KEY NOT NULL,
+    photo_name TEXT NOT NULL,
+    tag_id INTEGER NOT NULL,
+    CONSTRAINT tagid FOREIGN KEY (tag_id) REFERENCES tags (id) ON DELETE CASCADE ON UPDATE CASCADE
+);