Improve README

README.md

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 # skyportal-mobile
+
 Mobile version of the SkyPortal app
+
+<h1 align="center">
+  <br>
+  <img
+    src="https://github.com/skyportal/skyportal-mobile/raw/main/assets/images/icon.png"
+    alt="SkyPortal Logo"
+    width="100px"
+  />
+  <br>
+  SkyPortal Mobile
+  <br>
+</h1>
+
+<h2 align="center">
+An Astronomical Data Platform
+</h2>
+
+<p>
+  <span style="font-size: 180%;">
+  Please see the <a href="https://skyportal.io">project homepage</a> for more information about the web application.
+  </span>
+</p>
+
+## Installation & Usage
+
+SkyPortal Mobile relies on <a href="https://docs.expo.dev/">Expo</a> for building the mobile app. Installation and local development is relatively easy:
+
+```
+npm install
+npx expo start
+```
+
+## Production builds
+
+SkyPortal Mobile relies on <a href="https://docs.expo.dev/build/introduction/">EAS Build</a> for production builds.
+
+```
+eas build
+```