Update cheatsheets

go-mod

@@ -0,0 +1,29 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# go mod
+
+> Module maintenance.
+> More information: <https://golang.org/cmd/go/#hdr-Module_maintenance>.
+
+- Initialize new module in current directory:
+
+`go mod init {{moduleName}}`
+
+- Download modules to local cache:
+
+`go mod download`
+
+- Add missing and remove unused modules:
+
+`go mod tidy`
+
+- Verify dependencies have expected content:
+
+`go mod verify`
+
+- Copy sources of all dependencies into the vendor directory:
+
+`go mod vendor`