Update project_urls.py

project_urls.py

diff --git a/project_urls.py b/project_urls.py
index d1e1875..0398250 100644
--- a/project_urls.py
+++ b/project_urls.py
@@ -9,4 +9,5 @@
             'https://github.com/omerk/tinytapeout-verilog-test',
             'https://github.com/gregdavill/tinytapeout_spin0',
             'https://github.com/mole99/wokwi-1bit-alu',
+            'https://github.com/ericsmi/tinytapeout_popcnt.git',
     ]