docs: Update README for new doc structure (#1504)

Signed-off-by: Leonard Goodell <leonard.goodell@intel.com>

README.md

@@ -2,14 +2,17 @@
 # Application Functions SDK
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-Welcome the App Functions SDK for EdgeX. This sdk is meant to provide all the plumbing necessary for developers to get started in processing/transforming/exporting data out of EdgeX. 
+Welcome the App Functions SDK for EdgeX. This sdk is meant to provide all the plumbing necessary for developers to get started in processing/transforming/exporting data out of EdgeX.
+
+For latest documentation please visit 
+  - https://docs.edgexfoundry.org/latest/microservices/application/ApplicationServices/
+  - https://docs.edgexfoundry.org/latest/microservices/application/sdk/Purpose/
 
-For documentation please visit https://docs.edgexfoundry.org/latest/microservices/application/ApplicationServices/.
 For a list of examples please visit https://docs.edgexfoundry.org/latest/examples/AppServiceExamples/
 
 ## Build Prerequisites
 
-Please see the [edgex-go README](https://github.com/edgexfoundry/edgex-go/blob/master/README.md).
+Please see the [edgex-go README](https://github.com/edgexfoundry/edgex-go/blob/master/README.md#prerequisites).
 
 ## Versioning