[epic] Revamp readme

[OGKevin]

Whit the release of tinker, we will now use that as example. So example references to the example folder should be pointed to tinker code.

[OGKevin]

do-not-edit-start-codetree-epic-issues

Issues in this epic:

Title	Milestone	Assignees	Stage	State
[php] Update examples in readme #140	1.0.0	OGKevin	Closed
[csharp] Update examples in readme #91	1.0.0	OGKevin	Closed
[python] Update examples in readme #87	0.13.5	OGKevin	Closed
[Java] Update examples in readme #81	1.0.0	OGKevin	Closed

do-not-edit-end-codetree-epic-issues

[Wouter0100]

Listing monetary accounts example does not seem to work. Corrected one:

$monetaryAccountList = MonetaryAccount::listing();

foreach ($monetaryAccountList->getValue() as $monetaryAccount) {
    var_dump($monetaryAccount->getReferencedObject()->getDescription() . PHP_EOL);
}
``

[OGKevin]

@Wouter0100 😁 nice stop, feel free to create a PR to fix this :). Do you mind checking the readme's of the other 2 SDK's and create a PR ? They are referenced in the comment above.

[Wouter0100]

Sure! @OGKevin I'll get back to you asap when I have a complete overview and implemented the features I need :)