added style file

documentation/design/acm-sig-proceedings.csl

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+    <title>ACM SIG Proceedings ("et al." for 3+ authors)</title>
+    <id>http://www.zotero.org/styles/acm-sig-proceedings</id>
+    <link href="http://www.zotero.org/styles/acm-sig-proceedings" rel="self"/>
+    <link href="http://www.acm.org/sigs/publications/proceedings-templates" rel="documentation"/>
+    <author>
+      <name>Naeem Esfahani</name>
+      <email>nesfaha2@gmu.edu</email>
+      <uri>http://mason.gmu.edu/~nesfaha2/</uri>
+    </author>
+    <contributor>
+      <name>Chris Horn</name>
+      <email>chris.horn@securedecisions.com</email>
+    </contributor>
+    <contributor>
+      <name>Patrick O'Brien</name>
+    </contributor>
+    <category citation-format="numeric"/>
+    <category field="science"/>
+    <category field="engineering"/>
+    <updated>2017-07-15T11:28:14+00:00</updated>
+    <rights license="http://creativecommons.org/licenses/by-sa/3.0/">This work is licensed under a Creative Commons Attribution-ShareAlike 3.0 License</rights>
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