Update documentation to provide a simple example to setup a MaplessRepository about mapless HOT 2 CLOSED

@eMaringolo in the roadmap I have the change of making Mapless to be multi-repository so MaplessMongoPool will not be a singleton. Instead, they will be instances that can be created based on hostname, port and, if they use auth, also username and password.

So, to answer now, in release 0.3.1-alpha you'll need to define 2 env vars: MONGO_ADDRESS and MONGO_PORT to get it creating clients against it with no auth. And if you are using auth, in addition to that you'll either:

MaplessMongoPool instance 
	username: 'mongousername' ;
	password: 'mongopassword';
	yourself.

Or to define the env vars: DB_USERNAME and DB_PASSWORD

I can see the space for improvement too :D

from mapless.

Mapless is multi-repo now. It doesn't use singleton on the pool anymore.

Some examples in MaplessMongoMultiRepositoryTest

	repo1 := MaplessMongoRepository
		for: 'Mapless-Test1'
		with: (MaplessMongoPool hostname: anIpAddressString port: anInteger).
	repo2 := MaplessMongoRepository
		for: 'Mapless-Test2'
		with: MaplessMongoPool (MaplessMongoPool hostname: anotherIpAddressString port: anInteger).

cc/ @eMaringolo

from mapless.