Create nmod-unmarked.md (#1028)

_en/dep/nmod-unmarked.md

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+---
+layout: relation
+title: 'nmod:unmarked'
+shortdef : 'unmarked nominal modifier'
+udver: '2'
+---
+
+This relation is a subtype of the [nmod]() relation that applies
+when a non-possessive modifier within a nominal takes the form of a 
+nominal lacking a preposition (a.k.a. a noun phrase). It is 
+"unmarked" in that, unlike most `nmod`s, it has no adposition or
+genitive marking.
+
+`nmod:unmarked` merges two older subtypes, `nmod:npmod` and `nmod:tmod`.
+It has a clause-level countepart: [obl:unmarked]().
+
+Examples include:
+
+(i) temporal modifiers
+
+~~~ sdparse
+Are you free for lunch some day this week ?
+nmod:unmarked(lunch, day)
+det(day, some)
+nmod:unmarked(day, week)
+det(week, this)
+~~~
+
+(ii) rate expressions with meaning equivalent to "per"
+
+~~~ sdparse
+IBM earned $ 5 a share
+nmod:unmarked($, share)
+~~~
+
+(iii) elementary properties
+
+~~~ sdparse
+I want that color kitten
+nmod:unmarked(kitten, color)
+~~~
+
+~~~ sdparse
+a pizza the size of the sun
+nmod:unmarked(pizza, size)
+~~~
+
+(iv) emphatic reflexive pronouns
+
+~~~ sdparse
+Einstein himself was in attendance.
+nmod:unmarked(Einstein, himself)
+~~~
+
+(v) "a couple" as pre-head quantifier
+
+~~~ sdparse
+You can have a couple/NOUN cookies.
+det(couple, a)
+nmod:unmarked(cookies, couple)
+~~~
+
+**History:** Prior to release 2.15, case (i) (temporal modifiers)
+had a separate subtype called [nmod:tmod](), and [nmod:npmod]()
+was used for the non-temporal ones.