Add Open an Unnamed Buffer as a vim til.

vim/open-an-unnamed-buffer.md

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+# Open An Unnamed Buffer
+
+There are two ways (that I know of) to open an unnamed buffer.
+
+The first is before vim has even been launched. You can simply execute `vim`
+from the command-line without any arguments. Follow that by invoking `:ls`
+to see that the current and only buffer has *no name*.
+
+The second method is with a vim session that is already open. If you invoke
+`:new`, a new buffer will be created that, like the first method, has *no
+name*.