Updated README.md with links to the lua documentation. Added fujifilm_dynamic_range script to contrib. Added ChangeLog.md to keep track of recent changes.

ChangeLog.md

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+## Changes from most recent to oldest
+
+**17 Feb 2021 - wpferguson - API 6.2.3 register_action changes**
+
+* Added check for API version and supplied a name argument if the 
+API version was greater than or equal to 6.2.3 
+
+**10 Feb 2021 - wpferguson - bugfix select_untagged**
+
+* Fixed callback to return a list of images as expected instead of
+doing the selection in the callback
+
+**10 Feb 2021 - wpferguson - bugfix API 6.2.1 compatibility**
+
+* The inline check for API version didn't handle argument return
+correctly so added a transition library with a register_event function
+override to check the API version and process the arguments correctly.
+
+**9 Feb 2021 - wpferguson - bugfix API 6.2.2 compatibility**
+
+* The inline check for API version didn't handle argument return
+correctly so changed it to a full if/else block 
+
+**4 Reb 2021 - wpferguson - API 6.2.2 compatibililty**
+
+* Added check for API version and supplied a name argument to register_selection
+if the API version was greater than or eqal to 6.2.2 
+
+**1 Feb 2021 - wpferguson - API 6.2.1 compatibility**
+
+* Added check for API version and supplied a name argument to register_event
+if the API version was greater than or eqal to 6.2.1 
+
+**21 Jan 2021 - wpferguson - Modified dtutils function find_image_by_id**
+
+* For users with API 6.2.0 or greater - Enabled use of new API function
+darktable.database_get_image() in find_image_by_id().
+
+**19 Jan 2021 - schwerdf - Added dtutils library function find_image_by_id()**
+
+* Added new library function to retrieve an image from the library based on it's ID instead
+of it's row number in the database 
+
+**10 Jan 2021 - chrisaga - copy_attach_detach_tags localization**
+
+**7 Jan 2021 - dtorop - add contrib/fujifilm_dynamic_range**
+
+* add a new contrib script, fujifilm_dynamic_range to adjust exposure
+based on the exposure bias camera setting