diesel: Create migrations for users and pastes

Signed-off-by: ATechnoHazard <amolele@gmail.com>

migrations/2020-06-24-170630_create_paste/down.sql

@@ -0,0 +1 @@
+DROP TABLE IF EXISTS pastes

migrations/2020-06-24-170630_create_paste/up.sql

@@ -0,0 +1,7 @@
+CREATE TABLE IF NOT EXISTS pastes
+(
+    id VARCHAR PRIMARY KEY,
+    belongs_to VARCHAR references users(id),
+    is_url BOOLEAN NOT NULL DEFAULT 'f',
+    content TEXT NOT NULL
+)