[fix] typo

code-serverx/Dockerfile

@@ -33,7 +33,7 @@ RUN curl https://files.basex.org/releases/9.6.4/BaseX964.zip | jar xv && \
     chmod a+x /basex/bin/*;
 
 # install docker cli only
-RUN curl https://download.docker.com/linux/static/stable/x86_64/docker-20.10.12.tgz  | tar zxv -C /tmp/ && \\
+RUN curl https://download.docker.com/linux/static/stable/x86_64/docker-20.10.12.tgz  | tar zxv -C /tmp/ && \
     cp /tmp/docker/docker /usr/local/bin && rm -r /tmp/docker;
 
 # ports and volumes

code-serverx/readme.md

@@ -1,5 +1,13 @@
 # A BaseX development environment for vscode
 
+## docker build
+```
+docker build --tag=friendlyhello .
+```
+## compose
+```
+docker-compose up 
+```
 ## Includes
 * openjdk-11-jdk-headless
 * BaseX