Add docker related files

Dockerfile

@@ -0,0 +1,11 @@
+FROM ubuntu AS builder
+WORKDIR /app
+COPY httplib.h .
+COPY docker/main.cc .
+RUN apt update && apt install g++ -y
+RUN g++ -std=c++14 -static -o server -O3 -I. -DCPPHTTPLIB_USE_POLL main.cc
+
+FROM scratch
+COPY --from=builder /app/server /server
+COPY docker/index.html /html/index.html
+CMD ["/server"]