Add alarm API module ricxappframe.alarm.alarm

New python module provides data types like AlarmDetail and
an AlarmManager class to create, raise and clear alarms by
sending messages via RMR, which should route to Alarm Adapter.
Builds JSON messages to match implementation in ric-plt/alarm-go.
Add JSON schema for alarm message as documentation.
Bump xappframepy version to 1.2.0.

Issue-ID: RIC-380
Signed-off-by: Lott, Christopher (cl778h) <cl778h@att.com>
Change-Id: I746bca0c0982314b6837c042b60747398a92f456
diff --git a/docs/index.rst b/docs/index.rst
index 5004b5b..56b3154 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -14,6 +14,7 @@
    overview.rst
    user-guide.rst
    rmr_api.rst
+   alarm_api.rst
    developer-guide.rst
    release-notes.rst