Documentation prelude (#15377)

doc/prelude.rst

@@ -0,0 +1,29 @@
+Prelude
+=======
+
+This is an include file that simply imports common modules for your convenience:
+
+.. code-block:: nim
+  include prelude
+
+Same as:
+
+.. code-block:: nim
+  import os, strutils, times, parseutils, parseopt, hashes, tables, sets
+
+
+Examples
+========
+
+Get the basic most common imports ready to start coding using ``prelude``:
+
+.. code-block:: nim
+  include prelude
+
+  echo now()
+  echo getCurrentDir()
+  echo "Hello $1".format("World")
+
+
+See also:
+- `Sugar <sugar.html>`_