feat(grpc): add grpc server for replace

refactor(http): move http and routers into http

docs: add README and LICENSE

feat(lemonade): disable mysql connection if DB_HOST if empty

chore: add Dockerfile

feat: add gorm for getting words from mysql

feat(http): replace New with Default of gin

feat(http): add gin as http server

feat(lemonade): add filter

feat(trie): skip symbols

feat(trie): implement trie