Update README desc and add table of contents

I plan on adding more to this document in the future so adding a
table of contents.  Also clarified the description to not imply
everything is based on the journal.

Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Change-Id: Idc846ae0afb2dae76bb176ff1f0d879a72270c50
diff --git a/README.md b/README.md
index 66d2511..9e72dde 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,12 @@
 # phosphor-logging
-phosphor logging provides mechanism for common event and logging creation based
-on information from the journal log.
+The phosphor logging repository provides mechanisms for event and journal
+logging.
+
+## Table Of Contents
+* [Building](#to-build)
+* [Remote Logging](#remote-logging-via-rsyslog)
+* [Application Specific Error YAML](#adding-application-specific-error-yaml)
+* [Event Log Extensions](#event-log-extensions)
 
 ## To Build
 ```