restructure repo, separate sample app from docker configs

05-example-web-application/api-golang/README.md

@@ -0,0 +1,11 @@
+
+```
+go mod init api-golang
+go get -u github.com/gin-gonic/gin
+go get -u github.com/lib/pq
+```
+
+
+```
+go run src/main.go
+```