docs: examples for create table if not exists

README.md

@@ -2,10 +2,14 @@
 
 [![Go Reference](https://pkg.go.dev/badge/github.com/aldy505/bob.svg)](https://pkg.go.dev/github.com/aldy505/bob) [![Go Report Card](https://goreportcard.com/badge/github.com/aldy505/bob)](https://goreportcard.com/report/github.com/aldy505/bob) ![GitHub](https://img.shields.io/github/license/aldy505/bob) [![CodeFactor](https://www.codefactor.io/repository/github/aldy505/bob/badge)](https://www.codefactor.io/repository/github/aldy505/bob) [![codecov](https://codecov.io/gh/aldy505/bob/branch/master/graph/badge.svg?token=Noeexg5xEJ)](https://codecov.io/gh/aldy505/bob) [![Codacy Badge](https://app.codacy.com/project/badge/Grade/9b78970127c74c1a923533e05f65848d)](https://www.codacy.com/gh/aldy505/bob/dashboard?utm_source=github.com&utm_medium=referral&utm_content=aldy505/bob&utm_campaign=Badge_Grade) [![Build test](https://github.com/aldy505/bob/actions/workflows/build.yml/badge.svg)](https://github.com/aldy505/bob/actions/workflows/build.yml) [![Test and coverage](https://github.com/aldy505/bob/actions/workflows/coverage.yml/badge.svg)](https://github.com/aldy505/bob/actions/workflows/coverage.yml)
 
-I really need a create table SQL builder, and I can't find one. So, like everything else, I made one. Heavily inspired by [Squirrel](https://github.com/Masterminds/squirrel) and [Knex](https://knexjs.org/).
+I really need a create table SQL builder, and I can't find one. So, like everything else, I made one. Heavily inspired by [Squirrel](https://github.com/Masterminds/squirrel) and [Knex](https://knexjs.org/). And of course, I still use Squirrel for other types of queries (insert, select, and all), think this package as an extension for Squirrel.
 
 Oh, and of course, heavily inspired by Bob the Builder.
 
+```go
+import "github.com/aldy505/bob"
+```
+
 ## Usage
 
 It's not ready for production yet. But, the API is probably close to how you'd do things on Squirrel. This is an example for using with pgx.
@@ -61,6 +65,32 @@ func main() {
         log.Fatal(err)
       }
     }
+
+    // Create another table, this time with CREATE TABLE IF NOT EXISTS
+    sql, _, err := bob.CreateTableIfNotExists("inventory").
+      Columns("id", "userID", "items", "quantity").
+      Types("varchar(36)", "varchar(36)", "json", "int").
+      Primary("id").
+      ToSql()
+    if err != nil {
+      log.Fatal(err)
+    }
+    
+    inventoryQuery := strings.Split(sql, ";")
+    for i := range inventoryQuery {
+      _, err = db.Query(context.Background(), inventoryQuery[i])
+      if err != nil {
+        log.Fatal(err)
+      }
+    }
   }
 }
 ```
+
+## Contributing
+
+Contributions are always welcome! As long as you add a test for your changes.
+
+## License
+
+Bob is licensed under [MIT license](./LICENSE)