Add CI job

Author: kkorotkov

.github/CODEOWNERS

@@ -0,0 +1 @@
+* @Labs64/labs64-dev

.github/workflows/netlicesning-client-ci.yml

@@ -0,0 +1,34 @@
+# This workflow will build a C++ project with CMake, currently only on Ubuntu 22.04 / default GNU C++
+
+name: NetLicensing Client - CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: [self-hosted]
+    container: ubuntu:22.04
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Upgrade default packages
+      run: |
+        apt-get update
+        apt-get upgrade -y
+    - name: Install required dependencies
+      run: apt-get install -y git g++ cmake libcurl4-openssl-dev
+    - name: Build with CMake
+      run: |
+        mkdir build
+        cd build
+        cmake ..
+        make
+    - name: Run Demo App
+      run: |
+        cd build
+        ./netlicensing-client-demo

README.md

@@ -2,7 +2,7 @@
 
 # [Labs64 NetLicensing](https://netlicensing.io) Client (C++)
 
-[![Build Status](https://travis-ci.org/Labs64/NetLicensingClient-cpp.svg?branch=master)](https://travis-ci.org/Labs64/NetLicensingClient-cpp)
+[![Build Status](https://github.com/Labs64/NetLicensingClient-cpp/actions/workflows/netlicesning-client-ci.yml/badge.svg?branch=master)](https://github.com/Labs64/NetLicensingClient-cpp/actions/workflows/netlicesning-client-ci.yml)
 [![Apache License 2.0](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://github.com/Labs64/NetLicensingClient-cpp/blob/master/LICENSE)
 [![📖 Documentation](https://img.shields.io/badge/📖%20Documentation-Wiki-AB6543.svg)](https://netlicensing.io/wiki/restful-api)
 [![NetLicensing @ LinkedIn](https://img.shields.io/badge/NetLicensing-0077B5.svg?logo=LinkedIn)](https://www.linkedin.com/showcase/netlicensing)