Add an experiment to verify the binding of epoll_create(2)

experiments/epoll_create/epoll_create.adb

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+
+with Ada.Text_IO;
+with Interfaces.C;
+with Epoll;
+
+use Ada.Text_IO;
+use Interfaces;
+
+procedure Epoll_Create is
+    Max_Size : C.int := 10;
+begin
+    Put_Line (">> Start");
+
+    declare
+        use Interfaces.C;
+        RC : C.int := Epoll.Epoll_Create (Max_Size);
+    begin
+        Put_Line ("Epoll_Create returned: " & C.int'Image (RC));
+        if RC = -1 then
+            Put_Line (".. it appears that Epoll_Create encountered an error");
+        end if;
+    end;
+end Epoll_Create;

experiments/epoll_create/epoll_create.gpr

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+
+project Epoll_Create is
+    for Source_Dirs use ("../../src", ".");
+    for Main use ("epoll_create.adb");
+    for Object_Dir use "build";
+    for Exec_Dir use ".";
+
+    package Compiler is
+    for Default_Switches("ada") use
+            ("-O2", "-gnat05");
+    end Compiler;
+end Epoll_Create;
+