Added library example

docs/refex/README

@@ -86,3 +86,4 @@ ex80.pp contains an example of the High/Low functions.
 ex81.pp contains an example of the HexStr function.
 ex82.pp contains an example of the BinStr function.
 ex83.pp contains an example of the Assigned function.
+ex84.pp contains an example of the Library keyword.

docs/refex/ex84.pp

@@ -0,0 +1,24 @@
+Library Greeting;
+
+{$Mode objpas}
+
+Procedure Hello;
+
+begin
+  Writeln ('Hello, World !');
+end;
+
+Function GetNumber (Max : longint) : Longint;
+
+begin
+  Repeat
+    Write ('Please enter a nuber between 0 and ',max,' : ');
+    ReadLn (Result);
+  Until (Result>=0) and (Result<=Max);
+end; 
+
+exports
+  Hello,
+  GetNumber;
+  
+end.