DEVEXP-1409: README unification

[Hurus111]

No description provided.

[JPPortier]

Can we provide exact list of version used from CI matrix for validation ?
Do we have HTTP link onto each of them ?

[JPPortier]

Can we have empty cells onto 1st column when API category is same across rows ? (@marcos-sinch same for Python)

[JPPortier]

We could add also here a note about "End Of Sale" for SMS to avoid any new user going to implement SMS usage and not Conversation (@marcos-sinch same for Python)

[JPPortier]

May be pointing to the section related to Conversation:

sinch-sdk-node/examples/webhooks/src/controller/app.controller.ts

Lines 41 to 61 in af26fb0

	@Post('/conversation')
	public conversation(@Req() request: Request, @Res() res: Response) {
	// Initialize the class that will be used to validate the request and parse it
	const conversationCallbackWebhook = new ConversationCallbackWebhooks(SINCH_CONVERSATION_APP_SECRET);
	// 1 - The first thing to do is to verify the request is legit and has not been tampered with
	const validated = conversationCallbackWebhook.validateAuthenticationHeader(request.headers, request['rawBody']);
	if (!validated) {
	res.status(401).send('Invalid webhook signature');
	return;
	}
	try {
	// 2 - Before acting on the request, it must be parsed to verify it's supported and to revive its content
	const event = conversationCallbackWebhook.parseEvent(request.body);
	// 3 - Once steps 1 and 2 are ok, delegate the event management to the Conversation service
	this.conversationEventService.handleEvent(event);
	res.status(200).send();
	} catch (error) {
	console.error(error);
	res.status(500).send();
	}
	}