Add GitHub Actions workflow for R CMD check

.github/workflows/R-CMD-check.yaml

@@ -0,0 +1,20 @@
+name: R-CMD-check
+
+on: [push, pull_request]
+
+jobs:
+  R-CMD-check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up R
+        uses: r-lib/actions/setup-r@v2
+        with:
+          r-version: '4.4.1'
+      - name: Install dependencies
+        run: |
+          install.packages('devtools')
+          devtools::install_deps(dependencies = TRUE)
+      - name: Check
+        run: |
+          devtools::check()