Added readme, updated include guard pattern

README.md

@@ -0,0 +1,23 @@
+## Documentation
+
+This is a header-only library, as such most of its functional documentation is contained within the "header section" of the
+source code in the form of comments. It is highly recommended that you read said documentation before using this library.
+
+## Features
+
+The dvector library provides both common and more specialized 2D/3D vector math operations, its features include:
+
+- No hard dependencies besides the standard library, making it fully portable for most purposes
+- Provides vec2, vec3, vec4, quat, mat2, mat3, and mat4 types with various important operations
+- Supports an additional frst type along with frustum culling functions for spheres and AABBs
+- All dvector types are pass-by-value, allowing for easy use as arguments or return values
+
+## Attribution
+
+You are not required to give attribution when using this library. If you want to give attribution anyway, either link to
+this repository, [my website](https://www.slopegames.com/), or credit me as [BareRose](https://github.com/BareRose).
+If you want to support me financially, consider giving to my [Patreon](https://www.patreon.com/slopegames).
+
+## License
+
+Licensed under CC0 aka the most lawyer-friendly way of spelling "public domain".

dvector.h

@@ -34,7 +34,7 @@ dvector functions:
     All coordinate systems are right-handed unless otherwise noted. Projection functions assume OpenGL-style screen space.
 */
 
-//include only once
+//header section
 #ifndef DVECTOR_H
 #define DVECTOR_H
 
@@ -239,8 +239,11 @@ DVDEF frst frstFromMatrix(mat4);
 DVDEF int frstCullSphere(frst, vec3, DVTYPE);
 DVDEF int frstCullAABB(frst, vec3, vec3);
 
+#endif //DVECTOR_H
+
 //implementation section
 #ifdef DVECTOR_IMPLEMENTATION
+#undef DVECTOR_IMPLEMENTATION
 
 //vec2 functions
 DVDEF DVTYPE vec2Length (vec2 v) {
@@ -661,5 +664,4 @@ DVDEF int frstCullAABB (frst f, vec3 min, vec3 max) {
     return 1;
 }
 
-#endif //DVECTOR_IMPLEMENTATION
-#endif //DVECTOR_H
+#endif //DVECTOR_IMPLEMENTATION