implemented Docker, added default configuration

Dockerfile

@@ -0,0 +1,36 @@
+FROM golang:1.14-buster AS build-env
+
+COPY . ${GOPATH}/src/github.com/rls-moe/nyx
+WORKDIR ${GOPATH}/src/github.com/rls-moe/nyx
+
+RUN go build -o $GOPATH/bin/nyx
+
+FROM debian:bullseye
+LABEL maintainer="b.pedini@bjphoster.com"
+
+EXPOSE 8080
+
+RUN groupadd \
+    --gid 1000 \
+    nyx && \
+    useradd \
+    --home-dir /opt/nyx \
+    --comment "Nyx Board" \
+    --gid nyx \
+    --create-home \
+    --no-user-group \
+    --uid 1000 \
+    --shell /bin/bash \
+    nyx
+
+ENV USER nyx
+
+CMD [ "/usr/local/bin/nyx" ]
+
+COPY --from=build-env /go/bin/nyx /opt/nyx/nyx
+COPY --from=build-env /go/src/github.com/rls-moe/nyx/config.example.yml /opt/nyx/config.yml
+RUN ln -s \
+    /opt/nyx/nyx \
+    /usr/local/bin/nyx && \
+    chown -R \
+    nyx:nyx /opt/nyx

config.example.yml

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+site:
+    title: "NyxChan"
+    description: "NyxChan Default Configuration"
+
+db:
+    file: ":memory:"
+
+mastersecret: "changeme"
+listen_on: ":8080"
+
+captcha:
+    mode: "internal"