Initial doc for new android app

website/site/content/docs/tools/android.md

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+title = "Android Client"
+description = "A simple Android App to upload files from your devices."
+weight = 20
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+
+# Android Client
+
+There is a simple Android App available to conveniently upload files
+from your android devices. Combined with a scanner app, this allows to
+very quickly scan single page documents like receipts.
+
+The project lives at a [repository on
+github](https://github.com/docspell/android-client). It is planned to
+be available from the [F-Droid](https://f-droid.org) store, meanwhile
+download the APK from
+[here](https://github.com/docspell/android-client/releases/latest).
+
+
+# Usage
+
+The app is very simple:
+
+- You maintain a list of upload URLs. These can be inserted
+  conveniently by scanning the QR code. You need to create these
+  upload urls at docspell as described
+  [here](@/docs/webapp/uploading.md#anonymous-upload).
+- Start this app on your device and add a new URL
+- Then start some other app, and try to share a file. The *Share with*
+  or *Open with* dialog should contain now the docspell app. Choose
+  it.
+- You can now either select an URL from the app, or the upload begins
+  immediatly if you set a default URL.
+
+<div class="columns">
+  <div class="column">
+  {{ imgnormal(file="screenshot-create.jpg", width="") }}
+  <p class="has-text-centered subtitle"> (A) </p>
+  </div>
+  <div class="column">
+  {{ imgnormal(file="screenshot-choose.jpg", width="") }}
+  <p class="has-text-centered subtitle"> (B) </p>
+  </div>
+  <div class="column">
+  {{ imgnormal(file="screenshot-options.jpg", width="") }}
+  <p class="has-text-centered subtitle"> (C) </p>
+  </div>
+</div>
+<div class="columns">
+  <div class="column">
+  {{ imgnormal(file="screenshot-default.jpg", width="") }}
+  <p class="has-text-centered subtitle"> (D) </p>
+  </div>
+  <div class="column">
+  {{ imgnormal(file="screenshot-share.jpg", width="") }}
+  <p class="has-text-centered subtitle"> (E) </p>
+  </div>
+  <div class="column">
+  {{ imgnormal(file="screenshot-uploading.jpg", width="") }}
+  <p class="has-text-centered subtitle"> (F) </p>
+  </div>
+</div>
+
+## Create an URL
+
+Add a new one With the *Plus* button. The name (A-1) is to distinguish
+it in the list. The url (A-2) is used to upload files. You can add
+multiple URLs. You can give permissions to access the camera and use
+(A-3) to scan a QR code from the screen.
+
+## Edit and Default
+
+Tapping an item in the list switches the view that shows some options.
+You can set one URL as the default (C-1). When uploading a file, the
+screen to choose an URL is skipped then and the file is uploaded
+immediately.
+
+Other actions are editing the url (C-2), going back (C-3) or deleting the
+item (4).
+
+The screen (D) shows a default URL with a green background.
+
+## Upload
+
+Use some other app, for example OpenNoteScanner, and share the
+resulting files using the *Share With* menu (E). Then this app opens
+and uploads the file to your server (F).