add an example of dockerfile for building opencv

dockeropencv/Dockerfile

@@ -0,0 +1,45 @@
+FROM ubuntu:16.04 AS ubuntu
+
+ENV JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64
+
+RUN apt update && \
+# install required tools
+    apt install -y git unzip ant build-essential \
+                   cmake git libgtk2.0-dev pkg-config libavcodec-dev libavformat-dev libswscale-dev \
+                   python-dev python-numpy libtbb2 libtbb-dev libjpeg-dev libpng-dev libtiff-dev libdc1394-22-dev \
+                   python3 python3-dev python3-numpy \
+                   software-properties-common debconf-utils && \
+# install openjdk-8
+    apt install -y openjdk-8-jdk && \
+# libjasper-dev
+    curl -fs http://security.ubuntu.com/ubuntu/pool/main/j/jasper/libjasper1_1.900.1-debian1-2.4ubuntu1.2_amd64.deb -o /tmp/libjasper1.deb && \
+    curl -fs http://security.ubuntu.com/ubuntu/pool/main/j/jasper/libjasper-dev_1.900.1-debian1-2.4ubuntu1.2_amd64.deb -o /tmp/libjasper-dev.deb && \
+    apt install /tmp/libjasper1.deb /tmp/libjasper-dev.deb && \
+    rm -rf /tmp/* && \
+# download and prepare opencv
+    curl -fsL https://github.com/opencv/opencv/archive/3.4.10.zip -o /tmp/opencv.zip && \
+    cd /tmp && \
+    unzip opencv.zip && \
+    mv opencv-* opencv && \
+    cd opencv && \
+    mkdir build && \
+# build opencv
+    cd /tmp/opencv/build && \
+    cmake \
+    -D CMAKE_BUILD_TYPE=Release \
+    -D CMAKE_INSTALL_PREFIX=/usr/local \
+    -D WITH_FFMPEG=OFF \
+    -D WITH_IPP=OFF \
+    -D WITH_OPENEXR=OFF \
+    -D BUILD_EXAMPLES=OFF \
+    -D BUILD_ANDROID_EXAMPLES=OFF \
+    -D INSTALL_PYTHON_EXAMPLES=OFF \
+    -D BUILD_DOCS=OFF \
+    -D BUILD_opencv_python2=OFF \
+    -D BUILD_opencv_python3=OFF \
+    -D BUILD_SHARED_LIBS=OFF \
+    -D BUILD_TESTS=OFF \
+    -D BUILD_PERF_TESTS=OFF \
+    .. && \
+    make -j8
+#RUN cd /tmp/opencv/build && make install