Add basic c++ code to run within cpp-container

Dockerfile

@@ -0,0 +1,34 @@
+FROM ubuntu:noble
+LABEL title="CPP Container"
+LABEL version=1.0
+ENV GTEST_REPO=/googletest
+ENV GTEST_DIR=${GTEST_REPO}/googletest
+ENV WORKDIR=/usr/src
+WORKDIR /usr/src
+
+# Set Docker arguments
+ARG DEBIAN_FRONTEND=noninteractive
+
+# Install dependencies
+RUN apt-get update && \
+    apt-get install -y \
+            build-essential \
+            g++ \
+            cmake \
+            git-all \
+            dos2unix
+RUN apt-get clean
+
+# Setup GoogleTest
+RUN git clone --depth=1 https://github.com/google/googletest ${GTEST_REPO}
+RUN mkdir ${GTEST_REPO}/build && cd ${GTEST_REPO}/build \
+    && cmake .. -DBUILD_GMOCK=OFF && make && cd ${WORKDIR}
+
+# Copy repo source into container
+COPY . ${WORKDIR}
+
+# Assure Unix linefeed for all files
+RUN find . -type f -print0 | xargs -0 dos2unix --
+
+# Build project
+CMD sh -c ${WORKDIR}/test_runner.sh

README.md

@@ -1 +1,26 @@
-# CppMath
+# CppMath
+
+
+## Building in docker container
+
+If you have not already built the Docker container, use the following:
+
+```
+docker build -t cpp-container .
+```
+
+Once you have a built Docker container, run it interactively:
+
+```
+docker run -v "$(pwd)":/usr/src -it cpp-container sh
+```
+
+Then -- inside of the container -- compile the program:
+
+```
+g++ main.cpp
+```
+
+and if it compiles successfully, run it with `./a.out`
+
+To exit the container, type `exit`

main.cpp

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+#include <iostream>
+
+int main(){
+  double first, second;
+
+  std::cout<< "First number: ";
+  std::cin>> first;
+  std::cout<< "Second number: ";
+  std::cin>> second;
+
+  std::cout<< "Addition: "<< first << "+" << second << "=";
+  std::cout<< (first+second) << std::endl;
+  std::cout<< "Subtraction: "<< first << "-" << second << "=";
+  std::cout<< (first-second) << std::endl;
+
+  return 0;
+}