Update README.md

Author: trrt-good

README.md

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 # 3d-Math-Java
-A 3d math package, containing useful vector, matrix and quaternion methods - Well Documented
+An extensive 3d math package, well suited for games, 3d rendering or general math applications. 
+This is what I used for my [3d renderer](https://github.com/trrt-good/3d-Rendering-JAVA) project.
+
+## Features:
+
+### [Quaternion](https://github.com/trrt-good/3d-Math-Java/blob/main/Quaternion.java):
+- axis-angle conversion to quaternions
+- euler angle conversion to quaternion
+- inverse calculation
+- multiplcation function
+
+### [Matrix3x3](https://github.com/trrt-good/3d-Math-Java/blob/main/Matrix3x3.java):
+- determinant 
+- cofactor 
+- adjugate  
+- inverse 
+- matrix multiplication
+- component-wise multiplication
+- rotation matrix creation for each axis
+- rotation matrix creation for axis angle representations
+
+### [Vector3](https://github.com/trrt-good/3d-Math-Java/blob/main/Vector3.java):
+- magnitude calculation
+- normalization
+- all basic operations
+- quaternion conversion
+- dot product
+- cross product
+- lerp method 
+- matrix multiplcation
+- plane intersection calculation
+- projection to planes
+- projection to vectors
+- distance to a line
+- distance to a plane
+- angle between two vectors
+- unit vector creation from pitch and yaw angles
+- rotation methods for x y z axis
+- rotation method for axis angle representation
+- rotation method using quaternions
+
+### [Plane](https://github.com/trrt-good/3d-Math-Java/blob/main/Plane.java)
+(mainly just an object used by the [Vector3](https://github.com/trrt-good/3d-Math-Java/blob/main/Vector3.java) class)
+- calculating the paramtetric equation representation for a plane