add gitpod yaml and Dockerfile

.gitpod.Dockerfile

@@ -0,0 +1,6 @@
+FROM gitpod/workspace-full
+
+RUN bash -cl "rustup toolchain install stable && rustup target add wasm32-unknown-unknown"
+
+RUN bash -c ". .nvm/nvm.sh \
+             && nvm install v12 && nvm alias default v12"

.gitpod.yml

@@ -0,0 +1,32 @@
+image:
+  file: .gitpod.Dockerfile
+# Options to prebuild the image after github events and set notifications/badges
+github:
+  prebuilds:
+    # enable for the master/default branch (defaults to true)
+    master: true
+    # enable for all branches in this repo (defaults to false)
+    branches: true
+    # enable for pull requests coming from this repo (defaults to true)
+    pullRequests: true
+    # enable for pull requests coming from forks (defaults to false)
+    pullRequestsFromForks: true
+    # add a check to pull requests (defaults to true)
+    addCheck: true
+    # add a "Review in Gitpod" button as a comment to pull requests (defaults to false)
+    addComment: true
+    # add a "Review in Gitpod" button to the pull request's description (defaults to false)
+    addBadge: false
+    # add a label once the prebuild is ready to pull requests (defaults to false)
+    addLabel: false
+
+# List the start up tasks. You can start them in parallel in multiple terminals. See https://www.gitpod.io/docs/config-start-tasks/
+tasks:
+  - before: nvm use default
+    init: npm install near-shell -g
+
+vscode:
+  extensions:
+    - hbenl.vscode-test-explorer@2.15.0:koqDUMWDPJzELp/hdS/lWw==
+    - Swellaby.vscode-rust-test-adapter@0.11.0:Xg+YeZZQiVpVUsIkH+uiiw==
+    - bungcip.better-toml@0.3.2:3QfgGxxYtGHfJKQU7H0nEw==