Added some documentation on how to use the erlang qrcode library

README.markdown

@@ -25,3 +25,35 @@ Demo
 8. Handle PINs/logins for the second part of the "two factor" according to your application design.
 
 NOTE: This documentation is rather basic as this was open-sourced by specific request!
+
+
+How to use QR Code Encoder with Elixir
+======================================
+
+For now, the only way to compile qrcode is to start erlang, and compile all the files manually.
+::
+
+    cd src
+    erl
+
+    # In the interpreter, type the following:
+    c(gf256)
+    c(qrcode_demo)
+    c(qrcode_mask)
+    c(qrcode_matrix)
+    c(base32)
+    c(bits)
+    c(qrcode_demo)
+    c(qrcode)
+    c(qrcode_reedsolomon)
+
+Then, whenever you have this compiled, you should have access to the functions avaiable in elixir.
+
+ iex(1)> qrcode = :qrcode.encode(“bla”)
+ {:qrcode, 1, :M, 29,
+  <<0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 254, 211, 248, 4, 16, 208, 64, 46, 152, ...>>}
+  iex(2)> png = :qrcode_demo.simple_png_encode(qrcode)
+  <<137, 80, 78, 71, 13, 10, 26, 10, 0, 0, 0, 13, 73, 72, 68, 82, 0, 0, 0, 232, 0, 0, 0, ...>>
+  iex(3)> :file.write_file(“example.png”, png)
+  :ok
+