Feat: Add patterns to ignore files in the reference directory (#86)

Author: adrien-berchet

README.md

@@ -174,7 +174,7 @@ specific_args = {
 }
 ```
 
-And last but not least, it's possible to use regular expressions to associate specific arguments to
+Another possibility is to use regular expressions to associate specific arguments to
 a set of files:
 
 ```python
@@ -186,6 +186,22 @@ specific_args = {
 }
 ```
 
+And last but not least, it's possible to filter files from the reference directory (for example
+because the reference directory contains temporary files that should not be compared). For
+example, the following code will ignore all files whose name does not start with `file_` and does
+not ends with `_tmp.yaml`:
+
+```python
+import dir_content_diff
+
+dir_content_diff.compare_trees(
+    "reference_dir",
+    "compared_dir",
+    include_patterns=[r"file_.*"],
+    exclude_patterns=[r".*_tmp\.yaml"],
+)
+```
+
 
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