[wiki] Add server binary build info; link to developer guide from README.md

wiki/serverBuild.md

@@ -0,0 +1,9 @@
+## Building libmuttonserver
+This repository is also home to the code for the libmuttonserver binary.
+
+Official binaries are stripped of debug info for size and built without CGO (except for distribution packages) for portability, as follows:
+```
+CGO_ENABLED=0 go build -ldflags="-s -w" -trimpath ./libmuttonserver.go
+```
+
+**Ensure the server binary is named `libmuttonserver`!**