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Working on plugins and extensions example

docs/configuration_example.md

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+---
+title: Configuration example
+description: Some page configuration and extensions usage examples
+status: new
+---
+
+## Goals of this page
+
+This page aims to demonstrate some examples of a page configuration and examples usage of some extensions.
+
+## Admonition examples
+
+!!! note
+
+    note admonition example - not collapsible
+
+??? info
+
+    info admonition example - collapsible, not expanded by default
+
+???+ tip
+
+    tip admonition example - collapsible, expanded by default
+
+!!! warning
+
+    warning admonition example - not collapsible
+
+???+ example
+
+    example admonition example - collapsible, expanded by default
+
+## Code blocks examples
+
+```java title="frequencies-map-with-for.jsh"
+/**
+ * Run with JBang : jbang frequencies-map-with-for.jsh (1)
+ * <p>
+ * or open in JShell : /open frequencies-map-with-for.jsh
+ */
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+List<String> daysOfWeek = List.of("Friday", "Thursday", "Thursday", "Saturday", "Thursday", "Thursday", "Monday", "Saturday", "Friday", "Saturday");
+Map<String, Integer> frequencies = new HashMap<>();
+int previousCount;
+for (String day : daysOfWeek) {
+    previousCount = frequencies.getOrDefault(day, 0);
+    frequencies.put(day, previousCount + 1);
+}
+
+frequencies.entrySet().iterator().forEachRemaining(System.out::println);
+```
+
+1. :man_raising_hand: Code annotation example