Add missimg go-packages; Enhance demo6 README file

```sh

~$ docker pull golang

~$ cd ~/AdvantEDGE/examples/demo6 

~/AdvantEDGE/examples/demo6$ docker run --rm -it -v$PWD:/opt/local/etsi/demo6 golang bash -c "cd /opt/local/etsi/demo6 && ./build-demo6.sh"

~/AdvantEDGE/examples/demo6$ docker run --rm -it -v$PWD:/opt/local/etsi/demo6 golang

root@56c7b1ce74ca:/go# cd /opt/local/etsi/demo6

root@56c7b1ce74ca:/opt/local/etsi/demo6# go run ./main.go

```

# Menu description

# Compiled Object files, Static and Dynamic libs (Shared Objects)

*.o

*.a

*.so

# Folders

_obj

_test

# Architecture specific extensions/prefixes

*.[568vq]

[568vq].out

*.cgo1.go

*.cgo2.c

_cgo_defun.c

_cgo_gotypes.go

_cgo_export.*

_testmain.go

*.exe

*.test

*.prof

# Swagger Codegen Ignore

# Generated by swagger-codegen https://github.com/swagger-api/swagger-codegen

# Use this file to prevent files from being overwritten by the generator.

# The patterns follow closely to .gitignore or .dockerignore.

# As an example, the C# client generator defines ApiClient.cs.

# You can make changes and tell Swagger Codgen to ignore just this file by uncommenting the following line:

#ApiClient.cs

# You can match any string of characters against a directory, file or extension with a single asterisk (*):

#foo/*/qux

# The above matches foo/bar/qux and foo/baz/qux, but not foo/bar/baz/qux

# You can recursively match patterns against a directory, file or extension with a double asterisk (**):

#foo/**/qux

# This matches foo/bar/qux, foo/baz/qux, and foo/bar/baz/qux

# You can also negate patterns with an exclamation (!).

# For example, you can ignore all files in a docs folder with the file extension .md:

#docs/*.md

# Then explicitly reverse the ignore rule for a single file:

#!docs/README.md

3.0.29

 No newline at end of file

language: go

install:

  - go get -d -v .

script:

  - go build -v ./