Added Swarm Relays supplementary material

Author: beltrame

.github/workflows/main.yml

@@ -0,0 +1,15 @@
+on: [push]
+
+jobs:
+  nikola_build:
+    runs-on: ubuntu-latest
+    name: 'Deploy Nikola to GitHub Pages'
+    steps:
+    - name: Check out
+      uses: actions/checkout@v2
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install --upgrade pybtex
+    - name: Build and Deploy Nikola
+      uses: getnikola/nikola-action@v2