Base: Add more manpages for command-line utilities

Base/usr/share/man/man1/copy.md

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+## Name
+
+copy - copy text to the clipboard
+
+## Synopsis
+
+```**sh
+$ copy [options...] [text...]
+```
+
+## Description
+
+`copy` copies text from stdin or command-line argument (`text`) to the system clipboard. The clipboard is managed by WindowServer.
+
+## Options
+
+* `-t type`, `--type type`: MIME type of data stored in clipboard. The default type is `text/plain`.
+* `-c`, `--clear`: Clear the clipboard instead of copying.
+
+## Examples
+
+```sh
+# Copy some image to clipboard
+$ cat image.png | copy -t image/png
+
+# Place text 'foo' in clupboard
+$ copy foo
+```