Add an example using bash and jq

examples/bash/README.md

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+# SixtyFPS Bash example
+
+This shows how to use `sixtyfps-viewer` to display dialog from a bash script.
+
+This assume that the `sixtyfps-viewer` tool is in patch. This can be achieved with cargo install.
+(use the `--path tools/viewer` option to install it from the current repository.)
+
+```bash
+cargo install sixtyfps-viewer
+```
+
+The examples also assume that [`jq`](https://stedolan.github.io/jq/) is in the path
+
+ * `simple_input.sh`: shows how to query a few parameter with bash

examples/bash/simple_input.sh

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+#!/bin/bash -e
+# LICENSE BEGIN
+# This file is part of the SixtyFPS Project -- https://sixtyfps.io
+# Copyright (c) 2021 Olivier Goffart <olivier.goffart@sixtyfps.io>
+# Copyright (c) 2021 Simon Hausmann <simon.hausmann@sixtyfps.io>
+#
+# SPDX-License-Identifier: GPL-3.0-only
+# This file is also available under commercial licensing terms.
+# Please contact info@sixtyfps.io for more information.
+# LICENSE END
+
+OUTPUT=$(sixtyfps-viewer - --save-data - << EOF
+import { StandardButton, GridBox, LineEdit } from "sixtyfps_widgets.60";
+_ := Dialog {
+    property name <=> name-le.text;
+    property address <=> address-le.text;
+    StandardButton { kind: ok; }
+    StandardButton { kind: cancel; }
+    preferred-width: 300px;
+    GridBox {
+        Row {
+            Text { text: "Enter Your name"; }
+            name-le := LineEdit { }
+        }
+        Row {
+            Text { text: "Address"; }
+            address-le := LineEdit { }
+        }
+    }
+}
+EOF
+)
+NAME=$(jq -r ".name" <<< "$OUTPUT")
+ADDRESS=$(jq -r ".address" <<< "$OUTPUT")
+
+echo "Your name is $NAME and you live in $ADDRESS!"