doskey: add page (#2355)

pages/windows/doskey.md

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+# doskey
+
+> Manage macros, windows commands and command lines.
+
+- List available macros:
+
+`doskey /macros`
+
+- Create a new macro:
+
+`doskey {{name}} = "{{command}}"`
+
+- Create a new macro for a specific executable:
+
+`doskey /exename={{executable}} {{name}} = "{{command}}"`
+
+- Remove a macro:
+
+`doskey {{name}} =`
+
+- Display all commands that are stored in memory:
+
+`doskey /history`
+
+- Save macros to a file for portability:
+
+`doskey /macros > {{macinit}}`
+
+- Load macros from a file:
+
+`doskey /macrofile = {{macinit}}`