chore(deps): flutter pub add flutter_markdown

pubspec.lock

@@ -1,6 +1,14 @@
 # Generated by pub
 # See https://dart.dev/tools/pub/glossary#lockfile
 packages:
+  args:
+    dependency: transitive
+    description:
+      name: args
+      sha256: "7cf60b9f0cc88203c5a190b4cd62a99feea42759a7fa695010eb5de1c0b2252a"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.5.0"
   async:
     dependency: transitive
     description:
@@ -83,6 +91,14 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  flutter_markdown:
+    dependency: "direct main"
+    description:
+      name: flutter_markdown
+      sha256: "2e8a801b1ded5ea001a4529c97b1f213dcb11c6b20668e081cafb23468593514"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.7.3"
   flutter_test:
     dependency: "direct dev"
     description: flutter
@@ -133,6 +149,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "3.0.0"
+  markdown:
+    dependency: transitive
+    description:
+      name: markdown
+      sha256: ef2a1298144e3f985cc736b22e0ccdaf188b5b3970648f2d9dc13efd1d9df051
+      url: "https://pub.dev"
+    source: hosted
+    version: "7.2.2"
   matcher:
     dependency: transitive
     description: