refs #18562 [finc] expand Readme for caching info

Readme.md

@@ -45,11 +45,12 @@ Configuration
 
 Create an optional configuration file in config folder to overwrite default settings, for example:
 
-**rvktree.ini**
+**Example for rvktree.ini in folder /config/vufind:**
 
 [RVKWidget]
 apiUrl = "http://rvk.uni-regensburg.de/api/json/children/"
 
+; initial sections / categories
 rvk[] = "A"<br />
 rvk[] = "B"<br />
 rvk[] = "CA - CK"<br />
@@ -69,3 +70,6 @@ rvk[] = "MA - ML"<br />
 rvk[] = "MN - MS"<br />
 rvk[] = "N"<br />
 ...
+
+; max caching time in seconds, 86400 = 1 day
+ttl = 86400

composer.json

@@ -14,7 +14,8 @@
     ],
     "require": {
         "php": ">=7.1",
-        "finc/vufindhttp-psrcompat": "^0.0.2"
+        "finc/vufindhttp-psrcompat": "^0.0.2",
+        "zendframework/zend-mvc": "3.1.1"
     },
     "autoload": {
         "psr-4": {