Add README.md

Add initial README.md file for documentation purpose.

Signed-off-by: subhash kumar singh <subh.singh@samsung.com>
Change-Id: I8f42317ec67e3dd9059ef0a7220c6d0243f8497f

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+# O-RAN-SC Hello World Xapp in Golang
+
+This repository contains open-source code for a prototype golang xAPP for near real-time
+RAN Intelligent Controller which makes use of golang Xapp Framework.
+
+This xAPP aims to provide basic implementation of :
+
+1. A1 interfaces interactions
+
+2. Read-write operations into a persistent storage. 
+
+3. xAPP Configuration management
+
+4. RMR Health Check
+
+5. xAPP SDL Check
+
+6. Raising alarms
+
+7. Generating metrics
+
+8. E2 Interface intereactions
+
+
+Introduction
+------------
+
+This document provides guidelines on how to install and configure the HW Golang xAPP in various environments/operating modes.
+The audience of this document is assumed to have good knowledge in RIC Platform.
+
+
+Preface
+-------
+This xAPP can be run directly as a Linux binary, as a docker image, or in a pod in a Kubernetes environment.  The first
+two can be used for dev testing. The last option is how an xAPP is deployed in the RAN Intelligent Controller environment.
+This covers all three methods. 
+
+1. Docker 
+
+2. Linux Binary
+
+3. Kubernetes 
+
+
+:
+Software Installation and Deployment
+------------------------------------
+The build process assumes a Linux environment with golang >= 1.15  and  has been tested on Ubuntu. For building docker images,
+the Docker environment must be present in the system.
+
+
+##Build Process
+
+The HW xAPP can be either tested as a Linux binary or as a docker image.
+   1. **Linux binary**: 
+      TBD
+
+   2. **Docker Image**: From the root of the repository, run   *docker --no-cache build -t <image-name> ./* .
+
+
+##Deployment
+
+**Invoking  xAPP docker container directly** (not in RIC Kubernetes env.):
+        One can include the pod.yaml for including it in k8s build. Replace the image name with one built.
+        TBD: Adding hw-python to nexus repo
+
+
+Testing 
+--------
+
+Unit tests TBD
+
+
+## License
+
+```
+
+   Copyright (c) 2021 Samsung Electronics Co., Ltd. All Rights Reserved.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+
+```
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