add Esp table (#33)

* feat: create table esp

* feat: revert table esp

* feat: verify table esp

database/migration/deploy/esp.sql

@@ -0,0 +1,9 @@
+BEGIN;
+
+create table esp
+(
+    name character varying(20) not null,
+    ip   character varying(15) NOT NULL
+);
+
+COMMIT;

database/migration/revert/esp.sql

@@ -0,0 +1,5 @@
+BEGIN;
+
+drop table esp;
+
+COMMIT;

database/migration/verify/esp.sql

@@ -0,0 +1,8 @@
+BEGIN;
+
+select * from esp
+INSERT INTO esp (name, ip) VALUES ('ESP1', '192.168.1.10');
+SELECT ip FROM esp WHERE name = 'ESP1';
+
+
+COMMIT;