Add MrTrust GUI and Gitea release build

assets/certificates/README.md

@@ -0,0 +1,15 @@
+# Public Certificates
+
+Place the public MrSphay trust certificate here:
+
+```text
+MrSphay-LocalTrust-Root.cer
+```
+
+Generate it with:
+
+```powershell
+.\scripts\New-MrTrustCertificate.ps1
+```
+
+Only public `.cer` files belong in this directory. Never place `.pfx` files, private keys, or passwords here.