Create CODING_STYLE.txt

CODING_STYLE.txt

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+# PolyGun coding style
+
+## Indentation
+Use tabs for indentation (not spaces)
+
+## Blocks
+{ should be always inlined (also one space before it):
+```cpp
+if(condition) {
+	...
+}
+```
+or
+```cpp
+void something() {
+	 ...
+}
+```
+## Naming
+Use `lower_snake_case` for functions, methods, variable names and namespaces.
+Use `UPPER_SNAKE_CASE` for constants.
+Use `UpperCamelCase` for class names.
+
+## Include guards
+Use following pattern for include guards: `POLYGUN_<engine sector>_<filename>_HPP`. Notice that `<` and `>` are only used to denote what should be placed where
+and shouldn't be a part of final `#ifndef`.
+Example:
+```cpp
+#ifndef POLYGUN_RENDERER_TEXTURE_HPP
+#define POLYGUN_RENDERER_TEXTURE_HPP
+
+...
+
+#endif // POLYGUN_RENDERER_TEXTURE_HPP
+```
+
+## Namespaces
+Each function, class etc should be placed in appropriate namespace depending on which sector it belongs.
+For example: `polygun::renderer::Texture`
+
+## Variable prefixing
+Every non-static class member variable should be prefixed with `m_`, e.g. `m_renderer`. Static members should be prefixed with `s_`.
+
+## Filenames
+Use `lower_snake_case` for filenames.