Adds some documentation, add .clang-tidy file.

Signed-off-by: Deukhoofd <Deukhoofd@gmail.com>

src/Library/CreatureData/TalentIndex.hpp

@@ -2,15 +2,25 @@
 #define CREATURELIB_TALENTINDEX_HPP
 
 namespace CreatureLib::Library {
+    /// @brief Stores the index of a talent on a creature. Defines whether or not the talent is secret, and what it's
+    /// index is.
     class TalentIndex {
-        bool _secret;
-        uint8_t _index;
-
     public:
-        inline TalentIndex() noexcept : _secret(false), _index(0){};
+        inline TalentIndex() noexcept : _index(0){};
+        /// @brief Initialises a Talent Index from whether or not this is a secret talent, and it's index.
+        /// @param secret Whether or not this is a secret talent.
+        /// @param index The index of the talent on the species variant.
         inline TalentIndex(bool secret, uint8_t index) noexcept : _secret(secret), _index(index) {}
-        constexpr inline bool IsSecret() const noexcept { return _secret; }
-        constexpr inline bool GetIndex() const noexcept { return _index; }
+        /// @brief Returns whether or not this is a secret talent.
+        /// @return Whether or not this is a secret talent.
+        [[nodiscard]] constexpr inline bool IsSecret() const noexcept { return _secret; }
+        /// @brief Returns the index of the talent on the species variant.
+        /// @return The index of the talent on the species variant.
+        [[nodiscard]] constexpr inline uint8_t GetIndex() const noexcept { return _index; }
+
+    private:
+        bool _secret = false;
+        uint8_t _index;
     };
 }