First commit, Vystem v0.1

docs/shelter/std/mem.md

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+# Basic memory operations
+
+The Shelter standard library provide very basic memory operations primitives, defined in `shelter/lib/include/std/mem.h` and implemented inside `shelter/lib/src/std/mem.c`:
+- `SH_STATUS sh_mem_compare(const void *a,const void *b,sh_uint64 size)`: compare two memory regions with the same size. Return `SH_STATUS_SUCCESS` if both regions are equal, or `SH_STATUS_MEM_NOT_EQUAL` if one byte is different.
+- `SH_STATUS sh_mem_copy(const void *destination,const void *source,sh_uint64 size)`: copy one region of memory to another. Return `SH_STATUS_SUCCESS`
+- `SH_STATUS sh_mem_set_8(sh_uint8 *ptr,const sh_uint8 byte,sh_uint64 count)`: set a provided amount of bytes to the value of one provided byte. Return `SH_STATUS_SUCCESS`