Circle CI integration

Signed-off-by: Toni Uhlig <matzeton@googlemail.com>

.circleci/config.yml

@@ -0,0 +1,19 @@
+version: 2.1
+
+jobs:
+  build:
+    docker:
+      - image: ubuntu:latest
+    steps:
+      - checkout
+      - run: export DEBIAN_FRONTEND=noninteractive
+      - run: apt-get update -qq
+      - run: |
+          env DEBIAN_FRONTEND=noninteractive \
+          apt-get install -y -qq \
+          coreutils wget git unzip make cmake binutils gcc g++ autoconf automake flex bison texinfo \
+          libtool pkg-config gettext libjson-c-dev flex bison libpcap-dev zlib1g-dev
+      - run: |
+          cmake -S . -B build -DENABLE_SYSTEMD=ON -DBUILD_EXAMPLES=ON -DBUILD_NDPI=ON
+      - run: |
+          cmake --build build --verbose

README.md

@@ -1,5 +1,6 @@
 [![Build](https://github.com/utoni/nDPId/actions/workflows/build.yml/badge.svg)](https://github.com/utoni/nDPId/actions/workflows/build.yml)
 [![Gitlab-CI](https://gitlab.com/utoni/nDPId/badges/main/pipeline.svg)](https://gitlab.com/utoni/nDPId/-/pipelines)
+[![Circle-CI](https://circleci.com/gh/utoni/nDPId.svg?style=shield "Circle-CI")](https://app.circleci.com/pipelines/github/utoni/nDPId)
 
 # References