Add for plugin

cheat/cheatsheets/for

@@ -0,0 +1,17 @@
+# basic loop
+for i in 1 2 3 4 5 6 7 8 9 10
+do
+  echo $i
+done
+
+# loop ls command results
+for var in `ls -alF`
+do
+  echo $var
+done
+
+# loop specified number of times
+for i in `seq 1 10`
+do
+  echo $i
+done