For #235 - Add Glean crash count + docs.

app/src/main/java/org/mozilla/fenix/components/Analytics.kt

@@ -10,6 +10,7 @@ import android.content.Context
 import android.content.Intent
 import mozilla.components.lib.crash.CrashReporter
 import mozilla.components.lib.crash.service.CrashReporterService
+import mozilla.components.lib.crash.service.GleanCrashReporterService
 import mozilla.components.lib.crash.service.MozillaSocorroService
 import mozilla.components.lib.crash.service.SentryService
 import org.mozilla.fenix.BuildConfig
@@ -46,6 +47,8 @@ class Analytics(
             services.add(sentryService)
         }
 
+        services.add(GleanCrashReporterService(context))
+
         // The name "Fenix" here matches the product name on Socorro and is unrelated to the actual app name:
         // https://bugzilla.mozilla.org/show_bug.cgi?id=1523284
         val socorroService = MozillaSocorroService(context, appName = "Fenix")