docs: add ci job

Author: janek26

.github/workflows/node.js.yml

@@ -0,0 +1,38 @@
+name: Node.js CI
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+jobs:
+  build-and-test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version:
+          - 14.x
+    steps:
+      - uses: actions/checkout@v2
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v2
+        with:
+          node-version: ${{ matrix.node-version }}
+      - run: npm ci
+      - run: npm run build --if-present
+      - run: npm test
+  generate-docs:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
+        with:
+          node-version: 14.x
+      - run: npm ci
+      - run: npm run docs
+      - name: Do git actions
+        run: |
+          git add --force -- docs/README.md
+          git commit -m "docs: add generated docs"
+          git push

README.md

@@ -8,6 +8,7 @@
 
 <!-- primary badges -->
 <p align="center">
+  <img src="https://github.com/argentlabs/starknet/workflows/Node.js%20CI/badge.svg">
   <img src='https://img.shields.io/github/package-json/v/seanjameshan/starknet.js?label=npm' />
   <img src='https://img.shields.io/bundlephobia/minzip/starknet?color=success&label=size' />
   <!-- <img src='https://img.shields.io/npm/dt/starknet?color=blueviolet' /> -->