Add occam (#1254)

* Create Occam.occam

* Update readme.md

* Rename Occam.occam to occam.occam

* Update readme.md

o/occam.occam

@@ -0,0 +1,5 @@
+PROGRAM Hello
+#USE ioconv
+
+SEQ
+  write.full.string(screen,"Hello World")

readme.md

@@ -8,7 +8,7 @@ Thanks to everyone who continues to contribute; new languages are created every
 Make sure to see [contributing.md](/contributing.md) for instructions on contributing to the project!
 
 <!--Languages start-->
-## Languages (870 total)
+## Languages (871 total)
 
 * [!@#$%^&*()_+](%23/%21%40%23%24%25%5E%26%E2%88%97%28%29_%2B)
 * [():;#?!](%23/%28%29%CB%B8%3B%23%EF%BC%9F%21)
@@ -597,6 +597,7 @@ Make sure to see [contributing.md](/contributing.md) for instructions on contrib
 * [Objective J](o/Objective%20J.j)
 * [ObjectStar](o/ObjectStar)
 * [OCaml](o/OCaml.ml)
+* [occam](o/occam.occam)
 * [Octave](o/Octave.m)
 * [Odin](o/Odin.odin)
 * [Omgrofl](o/Omgrofl.omgrofl)