Add GitHub Actions CI

.Rbuildignore

@@ -34,4 +34,5 @@
 #----------------------------
 # LICENSE
 #----------------------------
-LICENSE
+LICENSE
+^\.github$

.github/.gitignore

@@ -0,0 +1 @@
+*.html

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

@@ -0,0 +1,32 @@
+# For help debugging build failures open an issue on the RStudio community with the 'github-actions' tag.
+# https://community.rstudio.com/new-topic?category=Package%20development&tags=github-actions
+on:
+  push:
+    branches:
+      - main
+      - master
+  pull_request:
+    branches:
+      - main
+      - master
+
+name: R-CMD-check
+
+jobs:
+  R-CMD-check:
+    runs-on: macOS-latest
+    env:
+      GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
+    steps:
+      - uses: actions/checkout@v2
+      - uses: r-lib/actions/setup-r@v1
+      - name: Install dependencies
+        run: |
+          install.packages(c("remotes", "rcmdcheck"))
+          remotes::install_deps(dependencies = TRUE)
+        shell: Rscript {0}
+      - name: Check
+        run: |
+          options(crayon.enabled = TRUE)
+          rcmdcheck::rcmdcheck(args = "--no-manual", error_on = "error")
+        shell: Rscript {0}

DESCRIPTION

@@ -22,6 +22,7 @@ Depends: R (>= 3.5.0)
 Imports: Rcpp (>= 0.12.16), Matrix, methods, utils, raster, gdistance, sp, stringr, tools, grDevices
 Suggests: 
     knitr,
+    markdown,
     testthat (>= 2.1.0),
     rmarkdown,
     formatR