add .Rbuildignore

Author: divine7022

.Rbuildignore

@@ -0,0 +1,19 @@
+^.*.Rproj$
+^.Rproj.user$
+^README.Rmd$
+^LICENSE.md$
+^.github$
+^data-raw$
+^_pkgdown.yml$
+^docs$
+^pkgdown$
+^.lintr$
+^codecov.yml$
+^.pre-commit-config.yaml$
+^bety.code-workspace$
+^create_issue.sh$
+^bety-ref.md$
+^renv$
+^renv.lock$
+^betydata\.Rproj$
+^\.Rproj\.user$