feat: add Makefile (#12)

Resolves #12

.Rbuildignore

@@ -14,3 +14,4 @@
 ^_pkgdown\.yml$
 ^docs$
 ^pkgdown$
+^Makefile$

Makefile

@@ -0,0 +1,21 @@
+PKGNAME = `sed -n "s/Package: *\([^ ]*\)/\1/p" DESCRIPTION`
+PKGVERS = `sed -n "s/Version: *\([^ ]*\)/\1/p" DESCRIPTION`
+
+all: check
+
+build: install_deps
+	R CMD build .
+
+check: build
+	R CMD check --no-manual $(PKGNAME)_$(PKGVERS).tar.gz
+
+install_deps:
+	Rscript \
+	-e 'if (!requireNamespace("remotes")) install.packages("remotes")' \
+	-e 'remotes::install_deps(dependencies = TRUE)'
+
+install: build
+	R CMD INSTALL $(PKGNAME)_$(PKGVERS).tar.gz
+
+clean:
+	@rm -rf $(PKGNAME)_$(PKGVERS).tar.gz $(PKGNAME).Rcheck