[knx] Docu: simplify Bridge and Thing configuration (#5713)

[knx] Documentation: simplify Bridge and Thing configuration

Simplification and more concrete information on Bridge and Thing configuration.
https://github.com/openhab/openhab2-addons/issues/5281#issuecomment-498284324

Signed-off-by: lewie helmut.lehmeyer@gmail.com

bundles/org.openhab.binding.knx/README.md

@@ -183,22 +183,50 @@ Each configuration parameter has a `mainGA` where commands are written to and op
 
 The `dpt` element is optional. If ommitted, the corresponding default value will be used (see the channel descriptions above).
 
-## Examples
-
-### Full Example
 
+## Examples
+The following two templates are sufficient for almost all purposes. Only add parameters to the Bridge and Thing configuration if you know exactly what functionality it is needed for.
+### Type ROUTER mode configuration Template
+knx.things:
+```xtend
+Bridge knx:ip:bridge [ 
+ type="ROUTER",
+ autoReconnectPeriod=60 //optional, do not set <30 sec.
+] {
+ Thing device knx_device "knx_device_name" @ "knx_device_group_in_paperui" [ 
+ //readInterval=3600 //optional, only used if reading values are present
+ ] {
+ //Items configurations
+ }
+}
+```
+### Type TUNNEL mode configuration Template
 knx.things:
-
 ```xtend
 Bridge knx:ip:bridge [ 
+ type="TUNNEL",
+ ipAddress="192.168.0.111",
+ autoReconnectPeriod=60 //optional, do not set <30 sec.
+] {
+ Thing device knx_device "knx_device_name" @ "knx_device_group_in_paperui" [ 
+ //readInterval=3600 //optional, only used if reading values are present
+ ] {
+ //Items configurations
+ }
+}
+```
+### Full Example
+```xtend
+//TUNNEL
+Bridge knx:ip:bridge [ 
+ type="TUNNEL", 
  ipAddress="192.168.0.10", 
  portNumber=3671, 
- localIp="192.168.0.11", 
- type="TUNNEL", 
+ localIp="192.168.0.11",
  readingPause=50, 
  responseTimeout=10, 
  readRetriesLimit=3, 
- autoReconnectPeriod=1,
+ autoReconnectPeriod=60,
  localSourceAddr="0.0.0"
 ] {
  Thing device generic [
@@ -216,6 +244,19 @@ Bridge knx:ip:bridge [
  Type datetime : demoDatetime "Alarm" [ ga="5/5/42" ]
  }
 }
+
+//ROUTER
+Bridge knx:ip:bridge [ 
+ type="ROUTER", 
+ ipAddress="224.0.23.12", 
+ portNumber=3671, 
+ localIp="192.168.0.11",
+ readingPause=50, 
+ responseTimeout=10, 
+ readRetriesLimit=3, 
+ autoReconnectPeriod=60,
+ localSourceAddr="0.0.0"
+] {}
 ```
 
 knx.items:
@@ -258,7 +299,7 @@ Bridge knx:serial:bridge [
  readingPause=50, 
  responseTimeout=10, 
  readRetriesLimit=3, 
- autoReconnectPeriod=1
+ autoReconnectPeriod=60
 ] {
  Thing device generic {
  Type switch-control : controlSwitch "Control Switch" [ ga="3/3/10+<3/3/11" ] // '<' signs are allowed but will be ignored for control Channels