Add button for beginers guide

Frontend/patient_manager/lib/mih_packages/about_mih/mih_about.dart

@@ -84,6 +84,12 @@ class _MIHAboutState extends State<MIHAbout> {
         const SizedBox(
           height: 10,
         ),
+        Wrap(
+            alignment: WrapAlignment.start,
+            crossAxisAlignment: WrapCrossAlignment.start,
+            spacing: 10,
+            runSpacing: 10,
+            children: [
               SizedBox(
                 width: 300,
                 height: 50,
@@ -94,9 +100,27 @@ class _MIHAboutState extends State<MIHAbout> {
                   buttonText: "Install MIH",
                   buttonColor:
                       MzanziInnovationHub.of(context)!.theme.secondaryColor(),
-            textColor: MzanziInnovationHub.of(context)!.theme.primaryColor(),
+                  textColor:
+                      MzanziInnovationHub.of(context)!.theme.primaryColor(),
                 ),
               ),
+              SizedBox(
+                width: 300,
+                height: 50,
+                child: MIHButton(
+                  onTap: () {
+                    html.window.open(
+                        'https://www.youtube.com/playlist?list=PLuT35kJIui0H5kXjxNOZlHoOPZbQLr4qh',
+                        'new tab');
+                  },
+                  buttonText: "MIH Benigners Guide",
+                  buttonColor:
+                      MzanziInnovationHub.of(context)!.theme.secondaryColor(),
+                  textColor:
+                      MzanziInnovationHub.of(context)!.theme.primaryColor(),
+                ),
+              ),
+            ]),
         const SizedBox(
           height: 10,
         ),