Add Gitpod config

.gitpod.Dockerfile

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+FROM gitpod/workspace-full
+                    
+USER gitpod
+
+# Install custom tools, runtime, etc. using apt-get
+# For example, the command below would install "bastet" - a command line tetris clone:
+#
+# RUN sudo apt-get -q update && #     sudo apt-get install -yq bastet && #     sudo rm -rf /var/lib/apt/lists/*
+#
+# More information: https://www.gitpod.io/docs/42_config_docker/

.gitpod.yml

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+tasks:
+  - init: cargo build
+    command: cargo watch -x run
+image:
+  file: .gitpod.Dockerfile

README.md

@@ -1,3 +1,5 @@
+[![Gitpod Ready-to-Code](https://img.shields.io/badge/Gitpod-Ready--to--Code-blue?logo=gitpod)](https://gitpod.io/#https://github.com/rust-lang/rustlings) 
+
 ![crab pet](https://i.imgur.com/LbZJgmm.gif)
 
 # rustlings 🦀❤️