//docs: Add coding style document

docs/CODING_STYLE.md

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+# TV2HV Coding Style
+
+This is enforced mostly by clang-format, but there are some rules that it doesn't enforce so they have to be written here. Don't worry, this won't be too much or too long.
+
+# Type names
+
+All type names are PascalCase, except for the trivial integer types.
+
+Good example:
+
+```cpp
+
+enum MyEnum : u8 {
+
+};
+
+struct MyStruct {};
+
+class MyClass {};
+
+```
+
+Bad example:
+
+```cpp
+class classExample {};
+```
+
+# Member/variable names
+
+Member and variable names are camelCase.
+
+```cpp
+class MyClass {
+	u8 value;
+public:
+	u8 getValue() const { return value; }
+};
+```