Add Readme.md

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Change-Id: Iba56718868043d3b19c71892f363fbb838f4988a
Signed-off-by: Chengkai Yan <martin.c.yan@est.tech>
Issue-ID: DCAEGEN2-1039

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+# DFC (DataFile Collector)
+
+Physical Network Function Registration Handler is responsible for registration of PNF (Physical Network Function) to
+ONAP (Open Network Automation Platform) in plug and play manner.
+
+## Introduction
+
+DFC is delivered as one **Docker container** which hosts application server and can be started by `docker-compose`.
+
+## Compiling DFC
+
+Whole project (top level of DFC directory) and each module (sub module directory) can be compiled using
+`mvn clean install` command.
+
+## Main API Endpoints
+
+Running with dev-mode of DFC
+
+- **Heartbeat**: http://<container_address>:8100/**heartbeat** or https://<container_address>:8443/**heartbeat**
+
+- **Start DFC**: http://<container_address>:8100/**start** or https://<container_address>:8433/**start**
+
+- **Stop DFC**: http://<container_address>:8100/**stopDatafile** or https://<container_address>:8433/**stopDatafile**
+
+## Maven GroupId:
+
+org.onap.dcaegen2.collectors
+
+### Maven Parent ArtifactId:
+
+dcae-services
+
+### Maven Children Artifacts:
+1. datafile-app-server: Datafile Collector (DFC) server
+2. datafile-commons: Common code for whole dfc modules
+3. datafile-dmaap-client: http client used to connect to dmaap message router/data router
+
+## License
+
+Copyright (C) 2018-2019 NOKIA Intellectual Property, 2018-2019 Nordix Foundation. All rights reserved.
+[License](http://www.apache.org/licenses/LICENSE-2.0)