diff --git a/.DS_Store b/.DS_Store
new file mode 100644
index 0000000..0e0786f
Binary files /dev/null and b/.DS_Store differ
diff --git a/.Rbuildignore b/.Rbuildignore
new file mode 100644
index 0000000..e0fc2d0
--- /dev/null
+++ b/.Rbuildignore
@@ -0,0 +1,23 @@
+^.*\.Rproj$
+^\.Rproj\.user$
+
+# Exclude GitHub stuff
+LICENSE$
+Readme\.md
+^appveyor\.yml$
+^docs$
+^_pkgdown\.yml$
+^\.github$
+
+# Readme RMD files
+^README_figs
+^README\.html$
+^README\.Rmd$
+^README-.*\.png$
+NEWS.md
+
+# -- Exclude compiled code --
+^src/.*\.o$
+^src/.*/.*\.o$
+^LICENSE\.md$
+^Makefile$
diff --git a/.github/.gitignore b/.github/.gitignore
new file mode 100644
index 0000000..2d19fc7
--- /dev/null
+++ b/.github/.gitignore
@@ -0,0 +1 @@
+*.html
diff --git a/.github/workflows/R-CMD-check.yaml b/.github/workflows/R-CMD-check.yaml
new file mode 100644
index 0000000..0528262
--- /dev/null
+++ b/.github/workflows/R-CMD-check.yaml
@@ -0,0 +1,58 @@
+# Workflow derived from https://github.com/r-lib/actions/tree/master/examples
+# Need help debugging build failures? Start at https://github.com/r-lib/actions#where-to-find-help
+on:
+  push:
+    branches: [main, master]
+  pull_request:
+    branches: [main, master]
+
+name: R-CMD-check
+
+jobs:
+  R-CMD-check:
+    runs-on: ${{ matrix.config.os }}
+
+    name: ${{ matrix.config.os }} (${{ matrix.config.r }})
+
+    strategy:
+      fail-fast: false
+      matrix:
+        config:
+          - {os: macOS-latest,   r: 'release'}
+          - {os: windows-latest, r: 'release'}
+          - {os: ubuntu-latest,   r: 'devel', http-user-agent: 'release'}
+          - {os: ubuntu-latest,   r: 'release'}
+          - {os: ubuntu-latest,   r: 'oldrel-1'}
+
+    env:
+      GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
+      R_KEEP_PKG_SOURCE: yes
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: r-lib/actions/setup-pandoc@v1
+
+      - uses: r-lib/actions/setup-r@v1
+        with:
+          r-version: ${{ matrix.config.r }}
+          http-user-agent: ${{ matrix.config.http-user-agent }}
+          use-public-rspm: true
+
+      - uses: r-lib/actions/setup-r-dependencies@v1
+        with:
+          extra-packages: rcmdcheck
+
+      - uses: r-lib/actions/check-r-package@v1
+
+      - name: Show testthat output
+        if: always()
+        run: find check -name 'testthat.Rout*' -exec cat '{}' \; || true
+        shell: bash
+
+      - name: Upload check results
+        if: failure()
+        uses: actions/upload-artifact@main
+        with:
+          name: ${{ runner.os }}-r${{ matrix.config.r }}-results
+          path: check
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..56843bc
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,7 @@
+.Rproj.user
+.Rhistory
+.RData
+.Ruserdata
+src/*.o
+src/*.so
+src/*.dll