Add README

Add README with examples only (and their outputs).

README.md

@@ -0,0 +1,36 @@
+
+## Examples
+
+### One iteration
+
+```sh
+./rule110.sed <<<0001
+```
+output:
+```
+00011
+```
+
+### Many iterations
+
+There's a useful helper script to run several iterations of the script, which
+uses '#' for 1 and ' ' for 0.
+
+```sh
+./run.sh 00000000001
+```
+output:
+```
+         #
+        ##
+       ###
+      ## #
+     #####
+    ##   #
+   ###  ##
+  ## # ###
+ ####### #
+ #     ###
+ #    ## #
+```
+