README.md: added Onset font's handwriting guide

Since we developed a handwriting guide using Onset's font,
let's add into our list of projects.

This patch adds Onset font's handwriting guide in README.md.

Co-authored-by: Shuralyov, Jean <jeanshuralyov@gmail.com>
Co-authored-by: Galyna, Cory <cory.galyna@gmail.com>
Co-authored-by: 湘渝萱 <alice.xiang.yu.xuan@gmail.com>
Co-authored-by: (Holloway) Chew, Kean Ho <me@chewkeanho.com>
Reviewed-by: (Holloway) Chew, Kean Ho <me@chewkeanho.com>
Signed-off-by: (Holloway) Chew, Kean Ho <me@chewkeanho.com>

Author: 4 people

README.md

@@ -1090,6 +1090,10 @@ public to use.
 * **Onest Font** - *a re-distributed OFL-licensed Latin font.* |
   [GitHub](https://github.com/ChewKeanHo/visuals-fonts-onest) |
   [Internal (Private URL)](/ChewKeanHo/visuals-fonts-onest)
+* **Onest Font Handwriting Guide** - *an open-licensed printable handwriting
+  guide using Onest font.* |
+  [GitHub](https://github.com/ChewKeanHo/visuals-handwriting-onest) |
+  [Internal (Private URL)](/ChewKeanHo/visuals-handwriting-onest)
 * **Orbitron Font** - *a re-distributed OFL-licensed Latin font.* |
   [GitHub](https://github.com/ChewKeanHo/visuals-fonts-orbitron) |
   [Internal (Private URL)](/ChewKeanHo/visuals-fonts-orbitron)

profile/README.md

@@ -1090,6 +1090,10 @@ public to use.
 * **Onest Font** - *a re-distributed OFL-licensed Latin font.* |
   [GitHub](https://github.com/ChewKeanHo/visuals-fonts-onest) |
   [Internal (Private URL)](/ChewKeanHo/visuals-fonts-onest)
+* **Onest Font Handwriting Guide** - *an open-licensed printable handwriting
+  guide using Onest font.* |
+  [GitHub](https://github.com/ChewKeanHo/visuals-handwriting-onest) |
+  [Internal (Private URL)](/ChewKeanHo/visuals-handwriting-onest)
 * **Orbitron Font** - *a re-distributed OFL-licensed Latin font.* |
   [GitHub](https://github.com/ChewKeanHo/visuals-fonts-orbitron) |
   [Internal (Private URL)](/ChewKeanHo/visuals-fonts-orbitron)