ci: setting up gitpod environment

.gitpod.yml

@@ -0,0 +1,9 @@
+image: gitpod/workspace-node
+
+tasks:
+  - init: yarn install
+
+vscode:
+  extensions:
+    - esbenp.prettier-vscode
+    - JuanBlanco.solidity

.vscode/settings.json

@@ -0,0 +1,12 @@
+{
+  "editor.formatOnSave": true,
+  "[solidity]": {
+    "editor.defaultFormatter": "esbenp.prettier-vscode"
+  },
+  "[json]": {
+    "editor.defaultFormatter": "esbenp.prettier-vscode"
+  },
+  "[typescript]": {
+    "editor.defaultFormatter": "esbenp.prettier-vscode"
+  }
+}