Add example program with dockerfile

Dockerfile

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+FROM gcc:latest
+
+WORKDIR /app
+
+COPY bin/hello_world /app/
+
+CMD ["bin/hello_world"]

README.md

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 # Docker-Test
 
-Just testing Docker together with C++

makefile

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+# Makefile for hello.c
+
+CC = g++  # C compiler
+CFLAGS = -O2 # Compiler flags (optimization level)
+
+SRC_DIR = src
+BUILD_DIR = build
+BIN_DIR = bin
+EXECUTABLE = Test
+
+# Create directories
+$(shell mkdir -p $(BUILD_DIR) $(BIN_DIR))
+
+SOURCES = $(wildcard $(SRC_DIR)/*.cpp)
+OBJECT_FILES = $(SOURCES:$(SRC_DIR)/%.cpp=$(BUILD_DIR)/%.o)
+
+$(BIN_DIR)/$(EXECUTABLE): $(OBJECT_FILES)
+	$(CC) $(CFLAGS) -o $@ $^
+
+$(BUILD_DIR)/%.o: $(SRC_DIR)/%.cpp
+	$(CC) $(CFLAGS) -c $< -o $@
+
+run:
+	$(BIN_DIR)/$(EXECUTABLE)
+
+clean:
+	rm -f $(BUILD_DIR)/*.o $(BIN_DIR)/*

src/main.cpp

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+#include <iostream>
+#include <string>
+
+int main() {
+    std::cout << "Hello, World!" << std::endl;
+    return 0;
+}