Updated README.md with benchmark results and config parameters explanation

Author: blancks

README.md

@@ -9,7 +9,7 @@ This project aims to compare their performance and functionality.
 
 The following PHP JSON Patch libraries are included in the benchmark:
 
-1. [**blancks/fast-jsonpatch-php**](https://github.com/blancks/fast-jsonpatch-php) (v1.1.3)
+1. [**blancks/fast-jsonpatch-php**](https://github.com/blancks/fast-jsonpatch-php) (v1.2.3)
 2. [**mikemccabe/json-patch-php**](https://github.com/mikemccabe/json-patch-php) (dev-master)
 3. [**php-jsonpatch/php-jsonpatch**](https://github.com/raphaelstolt/php-jsonpatch) (v4.1.0)
 4. [**xp-forge/json-patch**](https://github.com/xp-forge/json-patch) (v2.1.0)
@@ -40,21 +40,35 @@ The benchmarks were executed on the following system:
 
 ## RFC 6902 Compliance Test Results
 
+The compliance test strictly checks if the output json of each library is consistent with the RFC and if the library performs atomic operations. \
+Many libraries implicitly converts objects into arrays and while this make the compliace test fail it is still fine if you just have to consume the document in PHP.
+
 | Library                     | Tests                                                         |
 |-----------------------------|---------------------------------------------------------------|
 | blancks/fast-jsonpatch-php  | ![#008000](https://placehold.co/15x15/008000/008000.png) PASS |
 | mikemccabe/json-patch-php   | ![#990000](https://placehold.co/15x15/990000/990000.png) FAIL |
 | php-jsonpatch/php-jsonpatch | ![#990000](https://placehold.co/15x15/990000/990000.png) FAIL |
 | xp-forge/json-patch         | ![#990000](https://placehold.co/15x15/990000/990000.png) FAIL |
 | gamringer/php-json-patch    | ![#990000](https://placehold.co/15x15/990000/990000.png) FAIL |
-| swaggest/json-diff          | ![#008000](https://placehold.co/15x15/008000/008000.png) PASS |
+| swaggest/json-diff          | ![#990000](https://placehold.co/15x15/990000/990000.png) FAIL |
 | remorhaz/php-json-patch     | ![#008000](https://placehold.co/15x15/008000/008000.png) PASS |
 
 > **Note:** Libraries that fails this test will be benchmarked as well if no error occurs
 
-## Benchmark Results
+## Benchmark Results 
+
+The following table shows the average time each library took to apply a patch with 1000 operations to a target document as summary of the performance. \
+The actual benchmark data is available [here](https://docs.google.com/spreadsheets/d/1ZTDWh1k-zzhYHqZB3JMD2WRV0bPRIWUMRbLiMJhMLHk/edit?usp=sharing).
 
-...
+| Library                     | Microseconds                       |
+|-----------------------------|------------------------------------|
+| blancks/fast-jsonpatch-php  | 2903                               |
+| mikemccabe/json-patch-php   | 3355                               |
+| swaggest/json-diff          | 3638                               |
+| gamringer/php-json-patch    | 7276                               |
+| xp-forge/json-patch         | 8534                               |
+| php-jsonpatch/php-jsonpatch | 10970                              |
+| remorhaz/php-json-patch     | N/A (needs many hours to complete) |
 
 > **Note:** These results are indicative and may vary depending on the specific use case and system environment.
 
@@ -89,6 +103,27 @@ php jpbench blancks_fast-jsonpatch
 ```
 
 
+## Benchmark Configuration
+
+Benchmark configuration is located at `./src/config.php` \
+The following constants are available to customize the benchmark behavior:
+
+* `THREADS` the number of concurrent processes to spawn. \
+  _The benchmark is CPU intensive, do not put a value here higher than your processor logical cores_
+
+
+* `MAX_PATCHSIZE` the maximum number of operations for a single patch to benchmark
+
+
+* `ITERATIONS_PER_PATCH` how many times each patch size is benchmarked before moving to the next
+
+
+* `PATCH_NESTED_LEVEL` the number of tokens of the JSON pointer for each patch operation
+
+
+* `OUTPUT_FOLDER` folder where the benchmark results will be stored
+
+
 ## Contributing
 
 Contributions are welcome! If you know of another JSON Patch library that should be included in these benchmarks or have suggestions for improving the benchmarking process, please open an issue or submit a pull request.