Update cheatsheets

swagger-codegen

@@ -0,0 +1,25 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# swagger-codegen
+
+> Generate code and documentation for your REST api from a OpenAPI/swagger definition.
+> More information: <https://github.com/swagger-api/swagger-codegen>.
+
+- Generate documentation and code from an OpenAPI/swagger file:
+
+`swagger-codegen generate -i {{swagger_file}} -l {{language}}`
+
+- Generate Java code using the library retrofit2 and the option useRxJava2:
+
+`swagger-codegen generate -i {{http://petstore.swagger.io/v2/swagger.json}} -l {{java}} --library {{retrofit2}} -D{{useRxJava2}}={{true}}`
+
+- List available languages:
+
+`swagger-codegen langs`
+
+- Display help for a specific command:
+
+`swagger-codegen {{generate|config-help|meta|langs|version}} --help`