[gimp-web] Add Win Env Var info to README

[Pat David <patdavid src gnome org>]

commit 1d0c1605a1cb53a0496c12e9f7804d7716985aac
Author: Pat David <patdavid gmail com>
Date:   Sat Jul 17 14:17:47 2021 -0500

    Add Win Env Var info to README

 README.md | 7 +++++++
 1 file changed, 7 insertions(+)
---
diff --git a/README.md b/README.md
index 8c649863..3de572fc 100644
--- a/README.md
+++ b/README.md
@@ -85,6 +85,13 @@ To activate, as usual, `source py3-venv/bin/activate`.
 To de-activate, `deactivate`.
 
 
+#### Windows Environment Variables
+
+Due to Windows character encoding, you may see an error when trying to run pelican.
+
+You'll need to set Python to use UTF-8 character encodings by setting an Environment Variable `PYTHONUTF8` 
to the value `1`.
+
+
 ###  Pelican configuration files (pelicanconf.*)
 The main settings file to build the site is pelicanconf.*.