Create README.md

Author: taylorific

gcc/README.md

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+# GCC
+
+The GNU Compiler Collection is a compiling system that supports several languages.
+
+This image is based on https://github.com/docker-library/gcc
+
+### Compiling your app inside of a container
+
+To compile, but not run your app inside the Docker instance, you can write something like:
+
+```
+docker run -it --rm \
+  --mount type=bind,source="$(pwd)",target=/usr/src/myapp \
+  --workdir /usr/src/myapp \
+  docker.io/boxcutter/gcc:13 -std=c++17 -O2 myapp.c -o myapp -Wall
+```
+
+### Create a Containerfile in your app project
+
+```
+FROM docker.io/boxcutter/gcc:13
+
+WORKDIR /usr/src/myapp
+
+COPY . .
+RUN gcc -o myapp main.c
+
+CMD ["./myapp"]
+```