Add Coerce The Current Filetype as a vim til.

vim/coerce-the-current-filetype.md

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+# Coerce The Current Filetype
+
+If Vim doesn't recognize the filetype of the currently edited file, I can
+tell Vim what filetype to use. Consider, for instance, that I have a draft
+of a markdown file with the name, `documentation.md.draft`. Vim will not
+recognize this as a markdown file and will, thus, not apply markdown
+syntax highlighting to that file. I can easily tell Vim to treat this as a
+markdown file by setting its filetype:
+
+```
+:set filetype=markdown
+```
+
+Markdown syntax highlighting and other relevant options will now be applied
+to the current buffer.
+
+See `:h filetype` for more details.