Please document the default "Max. reconnect tries"

[lwcorp]

If you'd like to put out an incentive for implementing this feature, you can do so at https://issuehunt.io/r/bk138/droidVNC-NG

Is your feature request related to a problem? Please describe.

When you try to connect to a listening viewer or to a repeater, it lets you optionally fill "Max. reconnect tries" without stating what happens if you don't.

Describe the solution you'd like
Just use a field placeholder to state the default value and also document it in the README.

Describe alternatives you've considered

Irrelevant.

Your environment (please complete the following information):

• droidVNC-NG version: 2.9.3
• Android version: 14
• Client-side OS and version: Irrelevant
• VNC client and version: Irrelevant