feat: add pino logger

src/logger.js

@@ -0,0 +1,12 @@
+const { logLevel } = require('./config')
+const pino = require('pino')
+
+const logger = pino({
+  level: logLevel
+}, pino.destination(1, { sync: false }))
+
+logger.on('level-change', (lvl, val, prevLvl, prevVal) => {
+  logger.info('%s (%d) was changed to %s (%d)', prevLvl, prevVal, lvl, val)
+})
+
+module.exports = { logger }