Add mozc dial version.

Co-authored-by: Takashi Toyoshima <toyoshim@google.com>
Co-authored-by: Shun Ikejima <ikejima@google.com>

mozc-dial/README.md

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+[Japanese version](./README_ja.md) is available.
+
+# Gboard Dial Version
+
+This directory contains the design data and firmware for the Gboard Dial Version, released on October 1, 2025.
+The Gboard Dial Version is not an official Google product.
+
+![Gboard dial version](./images/dial.webp)
+
+**We've made things well-rounded.**
+
+"Keyboards are boring if you can only type on them."
+
+In response to feedback from our users,
+
+we have created a keyboard that you can turn.
+
+The Gboard Dial Version,
+
+realizing text input by rotation.
+
+## Let's build it
+
+![Gboard DIY](./images/diy.webp)
+
+This year again, we are releasing 3D printing model data, board data, and firmware.
+
+[Click here for the build guide](./buildguide.md)
+
+## There's also a non-rotating Gboard
+
+For those who are accustomed to conventional typing input,
+
+we also offer the standard version of Gboard.
+
+It provides a comfortable input experience
+
+in conjunction with various Google services
+
+such as voice input and translation functions.
+
+[Available on Google Play](https://play.google.com/store/apps/details?id=com.google.android.inputmethod.latin)<br>
+[Available on the App Store](https://apps.apple.com/us/app/gboard-the-google-keyboard/id1091700242)
+
+## [Other versions](https://github.com/google/mozc-devices)
+
+## License
+
+See [LICENSE](../LICENSE) file in this directory.