Reorganised resources, to differentiate between original and third party

resources/jme3/README.md

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+# README for jME3 sourced assets
+
+These should hold assets sourced from jMonkeyEngine, which are under this 
+[BSD style license](https://jmonkeyengine.org/license/).
+
+I'm excluding third party asset files from the public repository for now.
+The files here at present are:
+
+* images/Monkey.jpg
+* textures/terrain/brickwall/BrickWall.dds
+* textures/terrain/brickwall/BrickWall_dxt5.dds
+* textures/terrain/brickwall/BrickWall_height.jpg
+* textures/terrain/brickwall/BrickWall.j3m
+* textures/terrain/brickwall/BrickWall.jpg
+* textures/terrain/brickwall/BrickWall_normal.jpg
+* textures/terrain/brickwall/BrickWall_normal_parallax.dds
+* textures/terrain/brickwall/BrickWallPBR2.j3m
+* textures/terrain/brickwall/BrickWallPBR.j3m
+* textures/terrain/pond/Pond.dds
+* textures/terrain/pond/Pond_dxt5.dds
+* textures/terrain/pond/Pond.j3m
+* textures/terrain/pond/Pond.jpg
+* textures/terrain/pond/Pond_normal.png
+* textures/terrain/rock/Rock.j3m
+* textures/terrain/rock/Rock_normal.png
+* textures/terrain/rock/Rock.PNG
+* textures/terrain/splat/alpha1.png
+* textures/terrain/splat/alpha2.png
+* textures/terrain/splat/alphamap2.png
+* textures/terrain/splat/alphamap.png
+* textures/terrain/splat/dirt.jpg
+* textures/terrain/splat/dirt_normal.png
+* textures/terrain/splat/fortress512.png
+* textures/terrain/splat/grass.jpg
+* textures/terrain/splat/grass_normal.jpg
+* textures/terrain/splat/mountains1024.jpg
+* textures/terrain/splat/mountains128.png
+* textures/terrain/splat/mountains512.png
+* textures/terrain/splat/pools.png
+* textures/terrain/splat/road.jpg
+* textures/terrain/splat/road_normal.png
+
+These are all taken from the [jME3 3.6.1-stable distribution zip](https://github.com/jMonkeyEngine/jmonkeyengine/releases/tag/v3.6.1-stable). Feel free to download it if you need them.

resources/original/README.md

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+# README for original assets
+
+These are assets original to The Great Game, and are under this [GNU General Public License, version 2](https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html).

resources/polyhaven/README.md

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+# README for assets sourced from Poly Haven
+
+This directory should hold assets sourced from [Poly Haven](https://polyhaven.com/), 
+which are made available under 
+[Creative Commons Zero (CC0) license](https://creativecommons.org/publicdomain/zero/1.0/).
+
+These are high quality, but they're also pretty big! For this reason they're 
+excluded from the public repository.
+
+Files which are here at present are:
+
+* from [Pine Bark](https://polyhaven.com/a/pine_bark)
+    * textures/pine_bark_4k.blend
+    * textures/pine_bark_diff_4k.jpg
+    * textures/pine_bark_disp_4k.png
+    * textures/pine_bark_nor_4k.exr
+    * textures/pine_bark_rough_4k.blend
+* from [Sakura (cherry) bark](https://polyhaven.com/a/sakura_bark):
+    * textures/sakura_bark_4k.blend
+    * textures/sakura_bark_diff_4k.jpg
+    * textures/sakura_bark_disp_4k.png
+    * textures/sakura_bark_nor_gl_4k.exr
+    * textures/sakura_bark_rough_4k.exr
+
+If you need these feel free to download them yourself.

resources/textures/terrain/brickwall/BrickWall.j3m

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-Material Pong Rock : Common/MatDefs/Light/Lighting.j3md {
-     MaterialParameters {
-         Shininess            : 2.0
-         DiffuseMap           : Repeat Textures/Terrain/BrickWall/BrickWall.dds
-         NormalMap            : Repeat Textures/Terrain/BrickWall/BrickWall_normal_parallax.dds
-         PackedNormalParallax : true
-     }
-}

resources/textures/terrain/brickwall/BrickWallPBR.j3m

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-Material Pong Rock PBR : Common/MatDefs/Light/PBRLighting.j3md {
-     MaterialParameters {
-         Roughness : 1.0
-         Metallic : 0.0
-         BaseColorMap : Repeat Textures/Terrain/BrickWall/BrickWall.jpg
-         NormalMap : Repeat Textures/Terrain/BrickWall/BrickWall_normal_parallax.dds
-         PackedNormalParallax: true
-     }
-}

resources/textures/terrain/brickwall/BrickWallPBR2.j3m

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-Material Pong Rock PBR : Common/MatDefs/Light/PBRLighting.j3md {
-     MaterialParameters {
-         Roughness : 1.0
-         Metallic : 0.0
-         BaseColorMap : Repeat Textures/Terrain/BrickWall/BrickWall.jpg
-         ParallaxMap : Repeat Textures/Terrain/BrickWall/BrickWall_height.jpg         
-     }
-}

resources/textures/terrain/pond/Pond.j3m

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-Material Pong Rock : Common/MatDefs/Light/Lighting.j3md {
-    MaterialParameters {
-        DiffuseMap: Repeat Textures/Terrain/Pond/Pond.jpg
-        NormalMap: Repeat Textures/Terrain/Pond/Pond_normal.png
-        UseMaterialColors : true
-        Shininess: 32.0
-        Ambient  : 0.2 0.2 0.2 1.0
-        Diffuse  : 0.8 0.8 0.8 1.0
-        Specular : 0.3 0.3 0.3 1.0
-    }
-}

resources/textures/terrain/rock/Rock.j3m

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-Material Rock : Common/MatDefs/Light/Lighting.j3md {
-     MaterialParameters {
-         Shininess: 16.0
-         DiffuseMap : Textures/Terrain/Rock/Rock.PNG
-         NormalMap :  Textures/Terrain/Rock/Rock_normal.png
-     }
-}