test: write test codes with gh workflow

tests/School.test.ts

@@ -0,0 +1,14 @@
+import assert from 'node:assert'
+import test from 'node:test'
+import { comcigan } from '.'
+import { School } from '../src'
+
+test('Search schools by name', async () => {
+  const schools = await comcigan.searchSchools('중학교')
+  assert(schools.length > 0)
+})
+
+test('Get school by name', async () => {
+  const school = await School.fromName('중학교')
+  assert(school)
+})