Add associated_file_extensions to FileType schema (#48)

* Add `associated_file_extensions` to `FileType` schema

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* Tweak wording from review

Co-authored-by: Peter Kraus <peter.kraus@tu-berlin.de>

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Add regexp for file extensions field

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Peter Kraus <peter.kraus@tu-berlin.de>

examples/FileType-example.yaml

@@ -14,6 +14,9 @@ subject:
 associated_instruments:
     - Example Machine
     - Bunch of Junk
+associated_file_extensions:
+    - dat
+    - txt
 associated_software:
     - Example Software
     - Bitrot Software

examples/FileType-netcdf.yaml

@@ -11,8 +11,9 @@ associated_vendors:
     - UCAR
 subject:
     - climatology
-    - meteorology
-    - oceanography
+    - meteorology - oceanography
+associated_file_extensions:
+    - nc
 associated_software:
     - ArcGIS
     - OriginPro

schemas/filetype.yaml

@@ -48,6 +48,13 @@ classes:
                 description: >-
                     A list of any known software (proprietary or otherwise) that produces
                     such `FileType`.
+            associated_file_extensions:
+                multivalued: true
+                description: >-
+                    A list of any known file extensions that files of this `FileType`
+                    are found with. These may be used as a hint for `FileType` detection.
+                    Should omit the leading `'.'`, e.g. 'json' or 'txt'.
+                pattern: ^[A-z,0-9]*[A-z,0-9]+$
             base_formats:
                 multivalued: true
                 range: FileType