Added new style: Amber (#397)

* added a new style: amber

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* Update README.md

styles/amber/README.md

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+## style: amber
+
+Amber accenture and charcoal tones. I can't write sexy descriptions like Raysan, so just give it a try 😀
+
+![amber style table](style_amber.png)
+
+## style: provided files
+
+Several options are provided to add the style to a `raygui` application, choose the one that better fits the project.
+
+| file name | description |
+| :-------- | :---------- |
+| `style_amber.rgs` | Binary style file (raygui 4.0), font data compressed (recs, glyphs) |
+| `style_amber.h` | Embeddable style as code file, self-contained, includes font data |
+| `style_amber.png` | Style table image, contains `rGSf` chunk with binary `rgs` file data |
+
+## screenshot
+
+![amber style screen](screenshot.png)
+
+## about font
+
+"Inter" font by Rasmus Andersson.
+
+These fonts are licensed under the Open Font License.
+You can use them in your products & projects – print or digital, commercial or otherwise.
+[Inter](https://fonts.google.com/specimen/Inter/about)
+
+<sub>(The style font is optimized to look best at 16px, if you require different sizing please open the style in rGuiStyler and edit it. -Sarper Şoher)</sub>