Added Dockerfile and changed README

Dockerfile

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+FROM ubuntu:latest
+
+RUN apt-get update
+RUN apt-get -y install git
+RUN apt-get -y install build-essential
+
+
+WORKDIR /
+
+RUN git clone https://github.com/opcm/pcm.git
+
+WORKDIR /pcm
+
+RUN make
+
+ENTRYPOINT ["/pcm/pcm.x"]

README.md

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+# Dockerized version of Intel's Performance Counter Monitoring tool
+
+To build the docker image, we follow the normal procedure:
+
+```
+docker build -t intel-pcm .
+```
+
+To successfully run the container, we have to run the container with privileged capabilities as below:
+
+```
+docker run -ti --privileged=True pl4tinum/pcm:latest
+```
+
+
+