gox: add page (#3004)

pages/common/gox.md

@@ -0,0 +1,20 @@
+# gox
+
+> A tool for cross-compiling Go programs.
+> Homepage: https://github.com/mitchellh/gox.
+
+- Compile Go program in the current directory for all operating systems and architecture combinations:
+
+`gox`
+
+- Download and compile a Go program from a remote URL:
+
+`gox {{url_1}} {{url_2}}`
+
+- Compile current directory for a particular operating system:
+
+`gox -os="{{os}}"`
+
+- Compile current directory for a single operating system and architecture combination:
+
+`gox -osarch="{{os}}/{{arch}}"`