Fix logging level, improved README.md

Dockerfile

@@ -2,10 +2,10 @@
 FROM golang:alpine as builder
 
 RUN apk add --no-cache git ca-certificates && \
-    mkdir -p $GOPATH/src/git.adphi.net/Adphi/SERVICE_NAME && \
+    mkdir -p $GOPATH/src/git.adphi.net/Adphi/ytsflix && \
     mkdir /build
 
-WORKDIR $GOPATH/src/git.adphi.net/Adphi/SERVICE_NAME
+WORKDIR $GOPATH/src/git.adphi.net/Adphi/ytsflix
 ADD . .
 
 RUN go get -u github.com/gobuffalo/packr/... && \
@@ -21,6 +21,9 @@ COPY --from=builder /build/* /bin/
 
 ENV LOG_LEVEL=INFO
 ENV DATA_DIR=/downloads
+
+VOLUME /download
+
 EXPOSE 8080
 
 CMD ["ytsflix"]