Add CHANGELOG.md

Add a changelog file to make it easier to see what has changed.

Signed-off-by: James Hogan <[email protected]>

CHANGELOG.md

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+Version v23.09.b
+----------------
+
+General:
+ - Set GUI display transformations on all models
+
+[LNER Class A4](docs/a4.md) ("a4"):
+ - Work around wheel wobbling and yawing at speed on diagonal track
+ - Fix platform heights
+ - Enable spin animations in lite train module
+
+[Metro](docs/metro.md) ("metro"):
+ - Fix platform heights
+
+
+Version v23.09.a
+----------------
+
+Highlights:
+ - Add new train, [LNER Class A4](docs/a4.md), named "a4" (see below)
+ - Reorganise item overrides to use custom-model-data instead of using
+   unbreakable pickaxe damage levels (NOTE: this makes existing trains
+   that use the old resource pack incompatible with the new resource
+   pack, and vice versa. Only newly spawned trains will display
+   correctly).
+ - Add a lite version of saved train module, with fewer platforms used
+   in the trains for better performance.
+
+General:
+ - Clarify install instructions in README.md
+ - Include only .yml.in files instead of .yml
+ - Remove unused data in nodes of type EMPTY
+ - Delete empty lines in saved train module
+
+[LNER Class A4](docs/a4.md) ("a4"):
+ - Skinned as no. 4468 (Mallard) which holds the world speed record
+   for steam locomotives
+ - Fully articulated (leader, loco, trailer, tender)
+ - External detailing mostly done
+ - Minimal cab detailing, with seats and platforms to stand on
+ - Smoke from the chimney (from a hidden blaze)
+ - A roaring fire in the fire box (with hidden fire balls)
+ - Animated wheels (but they may go a bit crazy when fast on diagonal
+   track)
+ - Partially animated wheel mechanics
+
+
+Version v23.04.a
+----------------
+
+General:
+ - Reduce size of file paths
+
+[Metro train](docs/metro.md):
+ - Make bendy connection symmetrical
+ - Add seating and holds
+
+
+Version v23.02.a
+----------------
+
+Initial release of HoganFam TC Train Pack.