Add Washington DC chapter.

Author: danpaz

chapters/washingtondc.json

@@ -0,0 +1,10 @@
+{
+  "name": "NodeSchoolDC",
+  "location": "Washington, DC",
+  "country": "US",
+  "region": "North America",
+  "organizers": ["robbiethegeek", "joshfinnie", "JuanCaicedo", "danpaz"],
+  "website": "",
+  "twitter": "NodeSchoolDC",
+  "repo": "http://github.com/nodeschool/washingtondc"
+}