Add Rust-specific entries to .gitignore and fix README typo

- Add Rust build artifacts (target/, debug/) to .gitignore following
  Neo4jVSDoublets pattern
- Add rustfmt backup files, mutants.out, and RustRover entries
- Fix typo: "diffrence" → "difference" in README.md

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: konard

.gitignore

@@ -1,3 +1,25 @@
+# Generated by Cargo
+# will have compiled files and executables
+debug
+target
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+
+# MSVC Windows builds of rustc generate these, which store debugging information
+*.pdb
+
+# Generated by cargo mutants
+# Contains mutation testing data
+**/mutants.out*/
+
+# 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/
+
 ## Ignore Visual Studio temporary files, build results, and
 ## files generated by popular Visual Studio add-ons.
 ##

README.md

@@ -22,7 +22,7 @@ Both databases used to store and retrieve doublet-links representation. To suppo
 ## Results
 The results below represent the amount of time (ns) the operation takes per iteration.
 - First picture shows time in a pixel scale (for doublets just minimum value is shown, otherwise it will be not present on the graph).
-- Second picture shows time in a logarithmic scale (to see diffrence clearly, because it is around 2-3 orders of magnitude).
+- Second picture shows time in a logarithmic scale (to see difference clearly, because it is around 2-3 orders of magnitude).
 
 ### Rust
 ![Image of Rust benchmark (pixel scale)](https://github.com/linksplatform/Comparisons.PostgreSQLVSDoublets/blob/main/Docs/bench_rust.png?raw=true)