Add R for and while snippets

snippets/r.snippets

@@ -23,6 +23,16 @@ snippet ei
 		${0}
 	}
 
+# loops
+snippet wh
+while(${1}) {
+	${2}
+}
+snippet for
+for (${1:item} in ${2:list}) {
+	${3}
+}
+
 # functions
 snippet fun
 	${1:name} = function (${2:variables}) {