Key bindings Step 2 (#8872)

* Configurable key bindings - Enable via Hidden debug-option

* Configurable key bindings - better Help

* Configurable key bindings - better Widget step 1

android/assets/jsons/Tutorials.json

@@ -390,5 +390,27 @@
     "steps": [
         "One of your cities is under a naval blockade! When all adjacent water tiles of a coastal city are blocked - city loses harbor connection to all other cities, including capital. Make sure to de-blockade cities by deploying friendly military naval units to fight off invaders."
     ]
-  }
+  },
+    {
+        "name": "Keyboard Bindings",
+        "civilopediaText": [
+            {"text":"Limitations","header":3},
+            {"text":"This is a work in progress.","color":"#b22222","starred":true},
+            {"text":"For technical reasons, only direct keys or Ctrl-Letter combinations can be used.","starred":true},
+            {"text":"The Escape key is intentionally excluded from being reassigned.","starred":true},
+            {"text":"Currently, there are no checks to prevent conflicting assignments.","starred":true},
+            {},
+            {"text":"Using the Keys page","header":3},
+            {"text":"Each binding has a label, a text field, and a key button looking like this:"},
+            {"extraImage":"OtherIcons/Keyboard","imageSize":36},
+            {"text":"While hovering the mouse over the key button, you can press a desired key directly to assign it."},
+            {"text":"Alternatively, you can enter the key's name in the text field."},
+            {"text":"To reset a binding to its default, simply clear the text field."},
+            {},
+            {"text":"Bindings mapped to their default keys are displayed in gray, those reassigned by you in white."},
+            {},
+            {"text":"For discussion about missing entries, see the linked github issue.","link":"https://github.com/yairm210/Unciv/issues/8862"}
+        ],
+        // "uniques": ["Will not be displayed in Civilopedia"] // would prevent use for help link
+    }
 ]