Add Cedar artwork to sandbox projects

Add Cedar logo files in horizontal and icon layouts with color, black,
and white variants in both SVG and PNG formats. Add project entry to
sandbox examples and README.

Ref: cncf/sandbox#410
Signed-off-by: Victor Nicolet <victornl@amazon.com>

Author: victornicolet

README.md

@@ -109,6 +109,7 @@ You can find t-shirts, hoodies and stickers for Kubernetes at the CNCF [store](h
     * [Cartography](examples/sandbox_a-j.md#cartography-logos)
     * [Carvel](examples/sandbox_a-j.md#carvel-logos)
     * [cdk8s](examples/sandbox_a-j.md#cdk8s-logos)
+    * [Cedar](examples/sandbox_a-j.md#cedar-logos)
     * [ChaosBlade](examples/sandbox_a-j.md#chaosblade-logos)
     * [CloudNativePG](examples/sandbox_a-j.md#cloudnativepg-logos)
     * [Clusternet](examples/sandbox_a-j.md#clusternet-logos)

examples/sandbox_a-j.md

@@ -787,6 +787,47 @@
         </tr>
       </table>
 
+#### Cedar Logos
+
+<table>
+    <tr>
+        <th colspan="5"></th>
+    </tr>
+    <tr>
+        <th></th>
+        <th colspan="2">PNG</th>
+        <th colspan="2">SVG</th>
+    </tr>
+    <tr>
+        <th></th>
+        <th>horizontal</th>
+        <th>icon</th>
+        <th>horizontal</th>
+        <th>icon</th>
+    </tr>
+    <tr>
+        <th>color</th>
+        <td><img src="/projects/cedar/horizontal/color/cedar-horizontal-color.png" width="200"></td>
+        <td><img src="/projects/cedar/icon/color/cedar-icon-color.png" width="75"></td>
+        <td><img src="/projects/cedar/horizontal/color/cedar-horizontal-color.svg" width="200"></td>
+        <td><img src="/projects/cedar/icon/color/cedar-icon-color.svg" width="75"></td>
+    </tr>
+    <tr>
+        <th>black</th>
+        <td><img src="/projects/cedar/horizontal/black/cedar-horizontal-black.png" width="200"></td>
+        <td><img src="/projects/cedar/icon/black/cedar-icon-black.png" width="75"></td>
+        <td><img src="/projects/cedar/horizontal/black/cedar-horizontal-black.svg" width="200"></td>
+        <td><img src="/projects/cedar/icon/black/cedar-icon-black.svg" width="75"></td>
+    </tr>
+    <tr>
+        <th>white</th>
+        <td><img src="/projects/cedar/horizontal/white/cedar-horizontal-white.png" width="200"></td>
+        <td><img src="/projects/cedar/icon/white/cedar-icon-white.png" width="75"></td>
+        <td><img src="/projects/cedar/horizontal/white/cedar-horizontal-white.svg" width="200"></td>
+        <td><img src="/projects/cedar/icon/white/cedar-icon-white.svg" width="75"></td>
+    </tr>
+</table>
+
 #### ChaosBlade Logos
 
 <table>