Merge pull request #208 from ngocanhtve/patch-1

Add K-9 Mail

README.md

@@ -140,6 +140,7 @@ This list is solely a compilation of apps that adopt the Material You design gui
 ---
 ## 🆕 Newly Added Apps!
 *Last **25 apps** that were recently added to list!*
+- `MD` [K-9 Mail](https://github.com/thunderbird/thunderbird-android)  <sup>`FOSS`</sup>
 - `MD` [frigoligo](https://github.com/casimir/frigoligo)  <sup>`FOSS`</sup>
 - `MDY` [File Navigator](https://github.com/w2sv/FileNavigator)  <sup>`FOSS`</sup>
 - `MDY` [Easy Notes](https://github.com/Kin69/EasyNotes) <sup>`FOSS`</sup>
@@ -937,6 +938,7 @@ This list is solely a compilation of apps that adopt the Material You design gui
 - `MDY` [Infomaniak kMail](https://github.com/Infomaniak/android-kMail) <sup>`FOSS`</sup>
 - `MDY` [Spark Mail](https://play.google.com/store/apps/details?id=com.readdle.spark)
 - `MDY` [ltt.rs](https://codeberg.org/iNPUTmice/lttrs-android) <sup>`FOSS`</sup>
+- `MD` [K-9 Mail](https://github.com/thunderbird/thunderbird-android)  <sup>`FOSS`</sup>
 - `MY` [FairEmail](https://github.com/M66B/FairEmail) <sup>`FOSS`</sup>
 
 <sub>[📜Table Of Contents](#-table-of-contents)</sub>