Add "Install" section to README.md

README.md

@@ -1,14 +1,14 @@
 <p align="center">
-    <img src="https://raw.githubusercontent.com/ldeso/blitz/HEAD/metadata/en-US/images/icon.png" height="128">
+  <img src="metadata/en-US/images/icon.png" height="128" width="128">
 </p>
 
 <p align="center">
-    <a href="https://github.com/ldeso/blitz/releases/latest" alt="GitHub">
-        <img src="https://img.shields.io/github/release/ldeso/blitz.svg?logo=github&label=GitHub" /></a>
-    <a href="https://f-droid.org/packages/net.leodesouza.blitz/" alt="F-Droid">
-        <img src="https://img.shields.io/f-droid/v/net.leodesouza.blitz?logo=F-Droid&label=F-Droid" /></a>
-    <a href="https://play.google.com/store/apps/details?id=net.leodesouza.blitz" alt="Google">
-        <img src="https://img.shields.io/badge/Google-v1.5.2-blue?logo=Google-Play" /></a>
+  <a href="https://github.com/ldeso/blitz/releases/latest" alt="GitHub">
+    <img src="https://img.shields.io/github/release/ldeso/blitz.svg?logo=github&label=GitHub" /></a>
+  <a href="https://f-droid.org/packages/net.leodesouza.blitz/" alt="F-Droid">
+    <img src="https://img.shields.io/f-droid/v/net.leodesouza.blitz?logo=F-Droid&label=F-Droid" /></a>
+  <a href="https://play.google.com/store/apps/details?id=net.leodesouza.blitz" alt="Play Store">
+    <img src="https://img.shields.io/badge/Play%20Store-v1.5.2-blue?logo=Google-Play" /></a>
 </p>
 
 # Blitz: Fischer chess clock
@@ -19,17 +19,25 @@ The source code is entirely contained in the file [MainActivity.kt](app/src/main
 
 ## Features
 
-- Defaults to 5+3 Fischer timing (5 minutes + 3 seconds per move).
-- Total time and increment can be set by horizontal and vertical dragging.
-- The back action pauses or resets the clock.
+  - Defaults to 5+3 Fischer timing (5 minutes + 3 seconds per move).
+  - Total time and increment can be set by horizontal and vertical dragging.
+  - The back action pauses or resets the clock.
+
+## Install
+
+The app can be installed from three different sources:
+
+  1. [GitHub](https://github.com/ldeso/blitz/releases/latest): built and signed by the developer.
+  2. [F-Droid](https://f-droid.org/packages/net.leodesouza.blitz/): built and signed by the developer and [verified by F-Droid](https://f-droid.org/docs/Reproducible_Builds/) to correspond to the available source code.
+  3. [Play Store](https://play.google.com/store/apps/details?id=net.leodesouza.blitz): built and signed by Google, who is [allowed to modify](https://play.google/play-app-signing-terms/) the application to optimise its performance, security and/or size.
 
 ## Links
 
-License: [Apache-2.0](LICENSE) — [Issue Tracker](https://github.com/ldeso/blitz/issues) — [Source Code](https://github.com/ldeso/blitz) — [Changelog](CHANGELOG.md)
+[License: Apache-2.0](https://www.apache.org/licenses/LICENSE-2.0) — [Issue Tracker](https://github.com/ldeso/blitz/issues) — [Source Code](https://github.com/ldeso/blitz) — [Changelog](CHANGELOG.md)
 
 ## Screenshots
 
 <p align="center">
-    <img src="https://raw.githubusercontent.com/ldeso/blitz/HEAD/metadata/en-US/images/phoneScreenshots/1.png" height="311">&nbsp;
-    <img src="https://raw.githubusercontent.com/ldeso/blitz/HEAD/metadata/en-US/images/phoneScreenshots/2.png" height="311">
+  <img src="metadata/en-US/images/phoneScreenshots/1.png" height="622" width="350">&emsp;
+  <img src="metadata/en-US/images/phoneScreenshots/2.png" height="622" width="350">
 </p>