Add RustRover entry for Rust.gitignore

Add an optional entry for JetBrains's RustRover IDE in Rust.gitignore.

Signed-off-by: src_resources <src.res.211@gmail.com>

Rust.gitignore

@@ -12,3 +12,10 @@ Cargo.lock
 
 # MSVC Windows builds of rustc generate these, which store debugging information
 *.pdb
+
+# RustRover
+#  JetBrains specific template is maintained in a separate JetBrains.gitignore that can
+#  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
+#  and can be added to the global gitignore or merged into this file.  For a more nuclear
+#  option (not recommended) you can uncomment the following to ignore the entire idea folder.
+#.idea/