Add vim syntax-highlighting skeleton.

doc/brmember.vim

@@ -0,0 +1,20 @@
+if exists("b:current_syntax")
+  finish
+endif
+
+syn keyword brmKeyMandatory nick name mail phone
+syn keyword brmKeyOptional born
+syn keyword brmKeyMulti card desfire
+syn keyword brmKeyExistence joined destroyed
+syn keyword brmKeyMarkers studentstart studentstop suspendstart suspendstop
+
+syn region brmComment start="#" end="\n"
+
+hi def link brmKeyMandatory Identifier
+hi def link brmComment Comment
+hi def link brmKeyExistence Constant
+hi def link brmKeyOptional Conditional
+hi def link brmKeyMulti Type
+hi def link brmKeyMarkers Special
+
+let b:current_syntax = "brmember"