Add pre-commit configuration and ignore its config file

.Rbuildignore

@@ -1,13 +1,16 @@
-^renv$
-^renv\.lock$
-^.*\.Rproj$
-^\.Rproj\.user$
-^LICENSE\.md$
-^README\.Rmd
-^pkgdown\.css
-^docs
-^_pkgdown\.yml$
-^docs$
-^pkgdown$
-^data-raw$
-^test-example.R
+^.*\.Rproj$
+^LICENSE\.md$
+^README\.Rmd
+^\.Rproj\.user$
+^\.pre-commit-config\.yaml$
+^_pkgdown\.yml$
+^data-raw$
+^docs
+^docs$
+^pkgdown$
+^pkgdown\.css
+^renv$
+^renv$
+^renv\.lock$
+^renv\.lock$
+^test-example.R