chore: update README

README.md

@@ -1,5 +1,14 @@
 # populatedb
 
+Currently support:
+
+- mysql:
+  - varchar
+  - bigint
+  - int
+  - timestamp
+  - json
+
 ## Install
 
 ```sh
@@ -13,3 +22,17 @@ Example:
 ```sh
 populatedb g --dialect "mysql" --url "root:@tcp(localhost:4000)/production" --table "production_2022" --number 10000000
 ```
+
+## Contribute
+
+Feel free to ask or implement feature yourself :)
+
+## Roadmap
+
+- [ ] Support more database (postgres, sqlite, ...)
+- [ ] Support more database type
+
+## Thanks
+
+- [k1LoW/tbls](https://github.com/k1LoW/tbls)
+- [urfave/cli](https://github.com/urfave/cli)