Update cheatsheets

tldr/gradle-clean

@@ -0,0 +1,25 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# gradle clean
+
+> Delete the build directory and all generated files.
+> More information: <https://docs.gradle.org/current/userguide/command_line_interface.html#cleaning_outputs>.
+
+- Clean the build directory:
+
+`gradle clean`
+
+- Clean and then build the project:
+
+`gradle clean build`
+
+- Clean a specific subproject in a multi-project build:
+
+`gradle :{{subproject}}:clean`
+
+- Clean with more detailed logging:
+
+`gradle clean {{[-i|--info]}}`