Updating file 'docs/playground.md' with otterdog.

docs/playground.md

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+---
+template: editor.html
+hide:
+  - navigation
+  - toc
+---
+
+# Playground
+
+You can use the playground below to create and evaluate resource snippets to include in your jsonnet configuration:
+
+<div class="inverse hgroup">
+  <div class=hgroup-inline>
+    <div class="tab-window-input" id="input">
+      <div class="tab-header">
+      </div>
+      <textarea id=playground-jsonnet>
+{% include 'jsonnet/playground.jsonnet' %}
+      </textarea>
+      <textarea id=otterdog-defaults-libsonnet>
+{% include 'jsonnet/otterdog-defaults.libsonnet' %}
+      </textarea>
+      <textarea id=otterdog-functions-libsonnet>
+{% include 'jsonnet/otterdog-functions.libsonnet' %}
+      </textarea>
+    </div>
+    <div class="bigarrow">➡</div>
+    <div class="tab-window-output" id="output">
+      <div class="tab-header">
+        <div class=selected onclick="tab_output_click(this, 'json-output')">output.json</div>
+      </div>
+      <textarea readonly class="selected code-json" id="json-output">
+      </textarea>
+    </div>
+    <script>
+      demo(
+        'input',
+        {
+          'playground-jsonnet': 'playground.jsonnet',
+          'otterdog-defaults-libsonnet': 'otterdog-defaults.libsonnet',
+          'otterdog-functions-libsonnet': 'otterdog-functions.libsonnet'
+        },
+        'playground.jsonnet',
+        'output',
+        false,
+        false
+      );
+    </script>
+    <div style="clear: both"></div>
+  </div>
+</div>
+
+## Resource functions and default values
+
+The following snippets illustrate the functions to create the supported resources with default values as defined in the [default configuration](https://github.com/EclipseFdn/otterdog-defaults/blob/main/otterdog-defaults.libsonnet).
+used at the Eclipse Foundation.