chore: configure gitpod (#28)

* chore: configure gitpod

* chore: use `gitpod/workspace-base`

* chore: add nimsaem.nimvscode

Author: vil02

.gitpod.dockerfile

@@ -0,0 +1,7 @@
+FROM gitpod/workspace-base
+
+RUN curl https://nim-lang.org/choosenim/init.sh -sSf -o install_nim.sh \
+    && chmod +x ./install_nim.sh \
+    && ./install_nim.sh -y \
+    && rm install_nim.sh \
+    && echo "export PATH=/home/$(whoami)/.nimble/bin:\$PATH" >> ~/.bashrc

.gitpod.yml

@@ -0,0 +1,8 @@
+---
+image:
+  file: .gitpod.dockerfile
+
+vscode:
+  extensions:
+    - nimsaem.nimvscode
+...