Update pubspec.yaml

pubspec.lock

@@ -256,6 +256,11 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  flutter_web_plugins:
+    dependency: transitive
+    description: flutter
+    source: sdk
+    version: "0.0.0"
   glob:
     dependency: transitive
     description:
@@ -445,6 +450,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.2.1"
+  platform_detect:
+    dependency: transitive
+    description:
+      name: platform_detect
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.4.0"
   plugin_platform_interface:
     dependency: transitive
     description:
@@ -604,6 +616,41 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.2.0"
+  url_launcher:
+    dependency: "direct main"
+    description:
+      name: url_launcher
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "5.5.1"
+  url_launcher_linux:
+    dependency: transitive
+    description:
+      name: url_launcher_linux
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.0.1+1"
+  url_launcher_macos:
+    dependency: transitive
+    description:
+      name: url_launcher_macos
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.0.1+7"
+  url_launcher_platform_interface:
+    dependency: transitive
+    description:
+      name: url_launcher_platform_interface
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.8"
+  url_launcher_web:
+    dependency: transitive
+    description:
+      name: url_launcher_web
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.1.3"
   uuid:
     dependency: transitive
     description:

pubspec.yaml

@@ -21,6 +21,7 @@ environment:
   sdk: '>=2.7.0 <3.0.0'
 
 dependencies:
+  url_launcher: ^5.5.1
   markdown: ^2.1.8
   flutter_markdown: ^0.4.3
   esys_flutter_share: ^1.0.2