how can add a mini bathroom with shower in my bedroom

With any new bathroom fit the problem faced is always where to run waste water. Hot and cold supplies are run in copper and are under pressure, so they can be run alomost anywhere, but as the waste is normally 'gravity' fed there are restrictions on the layout. This can sometimes be overcome by the use of an electric pump but depends on the distance. It is also important to unstall the correct ventillation system. If a toilet is needed and the soil stack is not accessable then a 'saniflow' pump can be used, but there are also restrictions on height and distance.