Add Gitpod configuration

.gitpod.Dockerfile

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+FROM gitpod/workspace-full
+
+ARG FB_VERSION=1.08.1
+ARG OS_VERSION=ubuntu-20.04
+ARG OS_ARCH=x86_64
+ARG DOWNLOAD_NAME=FreeBASIC-$FB_VERSION-$OS_VERSION-$OS_ARCH
+
+WORKDIR /tmp/
+RUN wget https://sourceforge.net/projects/fbc/files/FreeBASIC-$FB_VERSION/Binaries-Linux/$OS_VERSION/$DOWNLOAD_NAME.tar.gz
+RUN tar -xvf $DOWNLOAD_NAME.tar.gz
+WORKDIR /tmp/$DOWNLOAD_NAME/
+RUN sudo ./install.sh -i 

.gitpod.yml

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+image:
+  file: .gitpod.Dockerfile

README.md

@@ -1,6 +1,8 @@
 # hexfile
 
-Simple command-line tool which prints a hex dump of a file. 
+Simple command-line tool which prints a hex dump of a file.
+
+[![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/#https://github.com/jlaasonen/hexfile)
 
 ## Requirements