Add espeak-ng (https://github.com/espeak-ng/espeak-ng)

metadata/com.reecedunn.espeak.yml

+Categories:
+  - Multimedia
+License: GPL-3.0-or-later
+SourceCode: https://github.com/espeak-ng/espeak-ng
+IssueTracker: https://github.com/espeak-ng/espeak-ng/issues
+Translation: https://www.transifex.com/projects/p/espeak-for-android
+Changelog: https://github.com/espeak-ng/espeak-ng/releases
+
+RepoType: git
+Repo: https://github.com/espeak-ng/espeak-ng.git
+
+Builds:
+  - versionName: 1.51-dev
+    versionCode: 20
+    commit: 5f1a4f9cbd84eca9ddfafccd1db541c23e4dbbf6
+    subdir: android
+    sudo:
+      - apt-get update || apt-get update
+      - apt-get install -y g++
+    gradle:
+      - yes
+    scanignore:
+      - phsource/
+    build:
+      - cd ..
+      - ./autogen.sh
+      - ./configure --with-gradle=gradle --with-extdict-ru --with-extdict-zh --with-extdict-zhy
+      - make espeakdata
+    buildjni:
+      - yes
+    ndk: r21e
+
+AutoUpdateMode: None
+UpdateCheckMode: None
+CurrentVersion: 1.51-dev
+CurrentVersionCode: 20