Add docs for new options providing per-directory configuration

Author: Aleksey Petryankin

doc/user_guide/configuration/all-options.rst

@@ -216,6 +216,20 @@ Standard Checkers
 **Default:**  ``False``
 
 
+--use-local-configs
+"""""""""""""""""""
+*When some of the linted files or modules have pylint config in the same directory, use their local configs for checking these files.*
+
+**Default:**  ``False``
+
+
+--use-parent-configs
+""""""""""""""""""""
+*Search for local pylint configs up until current working directory or root.*
+
+**Default:**  ``False``
+
+
 
 .. raw:: html
 
@@ -285,6 +299,10 @@ Standard Checkers
 
    unsafe-load-any-extension = false
 
+   use-local-configs = false
+
+   use-parent-configs = false
+
 
 
 .. raw:: html

doc/whatsnew/fragments/618.feature

@@ -0,0 +1,15 @@
+Add 2 new command line options: use-local-configs and use-parent-configs.
+
+use-local-configs enables searching for local pylint configurations in the same directory where linted file is located.
+For example:
+if there exists package/pylintrc, then
+pylint --use-local-configs=y package/file.py
+will use package/pylintrc instead of default config from $PWD.
+
+use-parent-configs enables searching for local pylint configurations upwards from the directory where linted file is located.
+For example:
+if there exists package/pylintrc, and doesn't exist package/subpackage/pylintrc, then
+pylint --use-local-configs=y --use-parent-configs=y package/subpackage/file.py
+will use package/pylintrc instead of default config from $PWD.
+
+Closes #618