Update go example, README

.devcontainer/Dockerfile

@@ -23,7 +23,15 @@ RUN go get -u -v \
     github.com/mgechev/revive \
     github.com/derekparker/delve/cmd/dlv
 
-# Install git, process tools
+# gocode-gomod
+RUN go get -x -d github.com/stamblerre/gocode \
+    && go build -o gocode-gomod github.com/stamblerre/gocode \
+    && mv gocode-gomod $GOPATH/bin/
+
+# Copy default endpoint specific user settings overrides into container to specify Python path
+COPY settings.vscode.json /root/.vscode-remote/data/Machine/settings.json
+
+# Verify git, process tools installed
 RUN apt-get update && apt-get -y install git procps
 
 # Clean up