Update cheatsheets

osx/codesign

@@ -0,0 +1,17 @@
+---
+syntax: markdown
+tags: [tldr, osx]
+source: https://github.com/tldr-pages/tldr.git
+---
+# codesign
+
+> Create and manipulate code signatures for macOS.
+> More information: <https://keith.github.io/xcode-man-pages/codesign.1.html>.
+
+- Sign an application with a certificate:
+
+`codesign --sign "{{My Company Name}}" {{path/to/application_file.app}}`
+
+- Verify the certificate of an application:
+
+`codesign --verify {{path/to/application_file.app}}`