eo_mono: add eo-intro tutorial for C#

tutorial/csharp/eo-intro/meson.build

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+project(
+  'efl-example-eo-intro', 'cs',
+  version : '0.0.1',
+  meson_version : '>= 0.38.0')
+
+efl_mono = dependency('efl-mono', version : '>=1.20.99')
+efl_mono_libs = efl_mono.get_pkgconfig_variable('mono_libs')
+
+subdir('src')
+

tutorial/csharp/eo-intro/src/eo_intro_main.cs

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+
+public class Example
+{
+    efl.model.Item root, child2;
+
+    // Create our test hierarchy
+    static void ObjCreate()
+    {
+        // First create a root element
+        root = new efl.model.Item(null, (efl.model.Item eroot) => {
+            eroot.SetName("Root");
+        });
+
+        // Create the first child element
+        new efl.model.Item(root, (efl.model.Item eroot) => {
+            eroot.SetName("Child1");
+        });
+
+        // Create the second child element, this time, with an extra reference
+        child2 = new efl.model.Item(root, (efl.model.Item eroot) => {
+            eroot.SetName("Child2");
+        });
+    }
+
+    // Destroy the test hierarchy
+    static void ObjDestroy()
+    {
+        // Destroy the root element
+        printf ("Deleting Root...\n");
+        efl_unref(root);
+        root.Dispose();
+
+        // Destroy the child2 element, for which we were keeping an extra reference
+        printf ("Deleting Child2...\n");
+        child2.Dispose();
+    }
+
+    public static void Main()
+    {
+        efl.All.Init(efl.Components.Ui);
+
+        // Create all objects
+        ObjCreate();
+
+        // Destroy all objects
+        ObjDestroy();
+
+        efl.All.Shutdown();
+    }
+}

tutorial/csharp/eo-intro/src/meson.build

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+src = files([
+  'eo_intro_main.cs',
+])
+
+deps = [efl_mono]
+
+executable('efl_example_eo_intro', src,
+  dependencies : deps,
+  cs_args : efl_mono_libs,
+  install : true
+)
+