Merge branch 'paintdroidnewapp' into 'master'

Newapp: Paintdroid

Closes rfp#1042

See merge request fdroid/fdroiddata!5525

metadata/org.catrobat.paintroid.yml

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+Categories:
+  - Graphics
+License: AGPL-3.0-or-later
+WebSite: https://www.catrobat.org
+SourceCode: https://github.com/Catrobat/Paintroid
+IssueTracker: https://jira.catrob.at/projects/PAINTROID/issues
+Changelog: https://github.com/Catrobat/Paintroid/releases
+
+AutoName: Paintroid
+Summary: Advanced Paint
+Description: |-
+    Paintroid is a graphical paint editor App, that, among others, allows
+    setting parts of pictures to transparent, insert Text / Images, add Layers,
+    use Color filling and picking tools, rotate, resize and position
+    elements...
+
+    It is also known as Pocket Paint, it is associated to Catroid (which is
+    like Scratch but for Android).
+
+RepoType: git
+Repo: https://github.com/Catrobat/Paintroid.git
+
+Builds:
+  - versionName: 2.4.1
+    versionCode: 30
+    commit: v2.4.1
+    subdir: app
+    gradle:
+      - yes
+
+AutoUpdateMode: None
+UpdateCheckMode: Tags
+CurrentVersion: 2.4.1
+CurrentVersionCode: 30

metadata/org.catrobat.paintroid/en-US/summary.txt

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+Advanced Paint