Add minimal examples

examples/002_ifelse_and_while.wl

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+<!--
+    You can embed elements based on conditions
+    using plain if-else statements
+-->
+
+let a = 2
+
+if a == 1: {
+    <a>The condition is true</a>
+} else {
+    <a>It is false</a>
+}
+
+<!--
+    If the branch occurs inside an HTML element,
+    you must escape the if keyword with a backslash
+-->
+
+<p>
+    \if a == 1: {
+        <a>The condition is true</a>
+    } else {
+        <a>It is false</a>
+    }
+</p>
+
+<!--
+    Similarly, you can execute code multiple times
+    based on a condition using a while statement.
+
+    The following loop generates the output
+
+        <a>I'm link number 1</a>
+        <a>I'm link number 2</a>
+        <a>I'm link number 3</a>
+
+    Note how the i variable is printed after adding
+    1 to it.
+-->
+
+let i = 0
+while i < 3: {
+    <a>I'm link number \i + 1</a>
+    i = i + 1
+}
+
+<!--
+    To insert the loop in an HTML element, you need
+    to escape it
+-->
+
+i = 0
+<ul>
+    \while i < 3: {
+        <li>I'm link number \i + 1</li>
+        i = i + 1
+    }
+</ul>