Add a UltiSnips snippet for groff

vim/.vim/own-snippets/nroff.snippets

@@ -0,0 +1,46 @@
+snippet title "Title header" bi
+.TH ${1:TITLE} ${2:SECTION} ${3:EXTRA}
+$0
+endsnippet
+
+snippet p "Paragraph" bi
+.PP 
+$0
+endsnippet
+
+snippet sect "Sectioned (unnumbered) headers" bi
+.SH ${1:SECTION NAME}
+$0
+endsnippet
+
+snippet ol "Ordered list setup" bi
+.nr step 1 1
+
+.IP \n+[step]
+$1
+$0
+endsnippet
+
+snippet oli "Ordered list item" bi
+.IP \n+[step]
+$1
+$0
+endsnippet
+
+snippet uli "Unordered list item" bi
+.IP \[bu]
+$1
+$0
+endsnippet
+
+snippet dl "Definition-style list item" bi
+.IP ${1:WORD}
+${2:DESCRIPTION}
+$0
+endsnippet
+
+snippet eq "Equation" bi
+.EQ
+${1:EQUATION}
+.EN
+endsnippet