Add US English hyphenation patterns.
The contents are a copy of upstream SVN revision 689:
svn://tug.org/texhyphen/trunk/hyph-utf8/tex/generic/hyph-utf8/patterns/txt/@689
Change-Id: If4e73fed4a8b61cdbcaf8a36c5c84d7cf18268fa
diff --git a/hyph-en-us.hyp.txt b/hyph-en-us.hyp.txt
new file mode 100644
index 0000000..b87163d
--- /dev/null
+++ b/hyph-en-us.hyp.txt
@@ -0,0 +1,14 @@
+as-so-ciate
+as-so-ciates
+dec-li-na-tion
+oblig-a-tory
+phil-an-thropic
+present
+presents
+project
+projects
+reci-procity
+re-cog-ni-zance
+ref-or-ma-tion
+ret-ri-bu-tion
+ta-ble