Update 593-file-mkdir.markdown

Author: Joe7M

_build/reference/593-file-mkdir.markdown

@@ -2,6 +2,25 @@
 
 > MKDIR dir
 
-Create a directory.
+Creates the directory `dir`. `dir` is a string representing a valid directory name. `dir` can additionally contain a path. Without a path, the directory will be created in the current working directory. Errors can be catched using TRY ... CATCH.
+
+### Example 1
+
+```
+mkdir "test"
+mkdir "C:\\test"    ' In Windows use \\ instead of \
+```
+
+### Example 2: Use TRY ... CATCH
+
+```
+' Run this program two times to get the error messege "FILE EXISTS"
+try
+    mkdir "test"
+catch err
+    print err
+end try
+```
+