add go mod

go.mod

@@ -0,0 +1,5 @@
+module git.caseydelorme.com/cdelorme/serve
+
+go 1.21.3
+
+require github.com/skratchdot/open-golang v0.0.0-20200116055534-eef842397966

go.sum

@@ -0,0 +1,2 @@
+github.com/skratchdot/open-golang v0.0.0-20200116055534-eef842397966 h1:JIAuq3EEf9cgbU6AtGPK4CTG3Zf6CKMNqf0MHTggAUA=
+github.com/skratchdot/open-golang v0.0.0-20200116055534-eef842397966/go.mod h1:sUM3LWHvSMaG192sy56D9F7CNvL7jUJVXoqM1QKLnog=