Add README.md and .gitignore

.gitignore

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+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx
+local.properties

README.md

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+# Description
+This is the a simple Android application serving the purpose of a shopping list. It was originally done during my semester abroad in Poland at the [Polish-Japanese Academy of Information Technology](https://www.pja.edu.pl/en/). I modelled it after how I would use a piece of paper and kept it as simple as possible.
+
+# Core features
+- Simple and intuitive to use
+- Dark and Light user interface
+- Localized in German and English
+- No permissions required
+- No tracking or sharing any data
+
+# Installation
+Sadly I am too lazy to set everything up for the official app store. You can download an .apk file from the releases page.
+

app/.gitignore

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+/build