implement skybox

Assets/Textures/Skies/planets/AllSkyFree_Readme.txt

@@ -0,0 +1,60 @@
+Welcome to AllSky Free!
+
+This is a small sample edition of the full version of Allsky.
+It contains a set of 10 skyboxes for use in your environments.
+I hope you find them useful!
+
+You can Buy the full version of AllSky here : 
+
+https://assetstore.unity.com/packages/2d/textures-materials/sky/allsky-200-sky-skybox-set-10109
+
+The full version has 200 skies for Unity! Provided as 6 sided cubemaps sized from x1024 to x2048 per-side along with an equirectangular cubemap texture ranging from 4k to 16k in size. Each has an example lighting setup scene!
+
+Various styles: Day, Night, Cartoon, Fantasy, Hazy, Epic, Space, Sunless and Moonless!
+
+For lighting artists, environment artists and indie developers looking for a wide suite of skies to light their environments.
+
+Lighting from day to night: Twilight, sunset, multiple times of day, multiple times of night, skyglow.
+
+Many weather and cloud types: Clear, overcast, summery, stormy, autumnal, hazy, epic, foggy, cumulus.
+
+
+TECHNICAL
+
+	Texture format: Each sky is a 6 sided cubemap. Source PNG texture resolution per-side ranges from x1024 to x2048.  Equirectangular images vary in size up to 16k textures.  
+
+	Skies are sorted by time of day or style in folders. 
+	Each individual sky has a folder which contains the textures and a material with those textures assigned. 
+	There is also a demo scene with example lighting and fog pass for reference.
+
+	Each sky has its own 6 sided skybox material which you can set to your scene's current skybox. 
+	Please consult the Unity documentation if you are unsure how to do this.
+	http://docs.unity3d.com/Manual/HOWTO-UseSkybox.html
+
+	There is also an equirectangular material. Some users report that this is preferable in their use-case or build platform.
+
+	The materials are mostly set as /mobile/skyboxes shaders - which should be fastest - but you can change them to the other skybox shaders that ship with Unity and set the required textures. Some add tint, exposure and rotation controls.
+
+	The import resolution and type of compression used on the sky textures is entirely up to you.  It should be set at a level which you feel utilises appropriate amounts of memory for your game amd platform, taking into account the amount of compression artifacts that you feel are acceptable.
+
+DEMO SCENE
+
+	Each sky folder also has a demo scene. This shows a simple low-poly environment to demonstrate lighting and fog settings for that sky.  
+
+	It was lit in the Forward Lighting Rendering Path with Linear lighting Color Space. 
+	For intended demo scene lighting values and fog to be visible you will need a project with those settings.
+	(Under Edit->Project Settings->Player)
+	If you have to change these settings it may be necessary to re-import the sky textures.
+
+	The demo scene can benefit from increasing the Pixel light count in quality settings, and the Shadow Distance.
+
+WHO
+
+	This asset pack is by Richard Whitelock.
+	A game developer, digital artist & photographer.
+	15+ years in the games industry working in a variety of senior art roles on 20+ titles. 
+	Particularly experienced in environment art, lighting & special FX.
+	Currently working on various indie game & personal projects. 
+
+	http://www.richardwhitelock.com
+