Add Sponsor button for GitHub repository
diff --git a/.github/FUNDING.yml b/.github/FUNDING.yml
new file mode 100644
index 0000000..05df08b
--- /dev/null
+++ b/.github/FUNDING.yml
@@ -0,0 +1 @@
+custom: ['https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=information%40libjpeg-turbo%2eorg&lc=US&item_name=The%20libjpeg-turbo%20General%20Fund&no_note=0&currency_code=USD&bn=PP%2dDonationsBF%3abtn_donateCC_LG%2egif%3aNonHostedGuest']