[ADD][GITIGNORE] Ignore non-personal vim files

Now that I'm tracking the '.vim' folder, I need to ignore all the files
that were automatically populated inside it by plug-ins or spelling.

.gitignore

@@ -0,0 +1,6 @@
+# Vim related files
+vim/.vim/.netrwhist
+vim/.vim/autoload/plug.vim*
+vim/.vim/plugged/
+vim/.vim/spell/
+vim/.vim/view/