Put some documentation

.gitignore

@@ -38,3 +38,4 @@ bin/tests.profdata
 bin/tests.profraw
 bin/test_n
 render.bmp
+README.html

README.md

@@ -1,3 +1,69 @@
 # gplib
 
-General Purpose library for POSIX systems
+General Purpose library for Freestanding C++ environment and POSIX systems.
+
+> Expects C++17
+
+## Datastructures
+
+### `buffer`
+
+Also named "slices" in other languages, they are a combination of a pointer and a size.
+
+### `array`
+
+A fixed size, inplace array. 
+
+### `indexed_array`
+
+A resizable, fragmentation resistant array, it associates elements with fixed indices. It will reuse deleted indices.
+
+### `optional`
+
+A Maybe monad, will not allocate for final classes or primitives.
+
+### `variant` and `fixed_variant`
+
+### `ring_list`
+
+### `bloomfilter`
+
+### `quotient_filter`
+
+## Algorithms
+
+## Tools
+
+### Allocators
+
+### Renderer
+
+### Internal file-system
+
+## GP Configuration
+
+### `enum class gp_errorcodes`
+
+This `enum` should not contain any non-zero value.
+
+- `infinite_skipstone`: used when a linear probing reaches infinity lookup
+
+### Generic elements
+
+- `constexpr bool gp_config::has_exceptions`: enables or disables exceptions throwing
+- `constexpr bool gp_config::has_buffer_bounds`: enables or disables bound checking
+- `constexpr size_t gp_config::arc4random_strength`: determines the amount of shuffling of the arc4random PRNG
+- `constexpr /* T */ gp_config::assertion`: `T` is a callable type taking a boolean predicate and a `const char*`
+- `typedef /* T */ file_descriptor_t`: `T` is an integer type. No negative value should be expected
+
+
+### Rendering and mathematics
+
+- `using gp_config::rendering::default_type`: provide a numeric type for rendering and for the mathematical framework
+- `constexpr default_type gp_config::rendering::epsilon`: a small value of the default type (example for float: `0.001f`)
+- `#define GP_CONFIG__RENDERING__COLOR_T`: a configuration define for storing a color for rendering purposes
+
+### Memory
+
+- `using gp_config::memory_module::default_allocator`: a default constructible allocator type
+- `constexpr bool gp_config::memory_module::is_ok`: true if the default allocator is able to allocate, false if not