Adding Coq hello world program (#1423)

* Create Coq.v

* Update readme.md

* Removed useless things

* Update c/Coq.v

Co-authored-by: Gabe <66077254+MrBrain295@users.noreply.github.com>

c/Coq.v

@@ -0,0 +1,11 @@
+Require Import Coq.Lists.List.
+Require Import Io.All.
+Require Import Io.System.All.
+Require Import ListString.All.
+
+Import ListNotations.
+Import C.Notations.
+
+(** The classic Hello World program. *)
+Definition hello_world (argv : list LString.t) : C.t System.effect unit :=
+  System.log (LString.s "Hello World").