First commit, Vystem v0.1

docs/shelter/memory/ring.md

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+# Ring buffer
+
+## Introduction
+
+The memory subsystem provide a simple ring buffer API, mainly used by the log API. This implementation doesn't allow for automatic structure initialization with allocation. The structure has to be manually created for it to work. This ring buffer implementation is defined inside `shelter/lib/include/memory/ring.h` and implemented inside `shelter/lib/src/memory/ring.c`
+
+## Overview
+
+The main structure for a ring buffer is `sh_ring_RING_BUFFER_HEADER`. The function provided by the API are volontary very simple for the moment:
+- `SH_STATUS sh_ring_write_byte(sh_ring_RING_BUFFER_HEADER *ring_buffer,sh_uint8 byte)`: write a byte inside provided ring buffer
+- `SH_STATUS sh_ring_write_string(sh_ring_RING_BUFFER_HEADER *ring_buffer,char *string)`: write a null-terminated string inside provided ring buffer