First commit, Vystem v0.1

docs/boottools/index.md

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+# Bootloader tools Docs
+
+In order to generate all necessary components for the build of a Vystem disk image, we have created several C++ tools designed to help generating these components. All of these tools have been intented to be used only in a normal Linux environnement. Here is the list of bootloader tools:
+1) [bootanim](bootanim.md)
+2) [fontgen](fontgen.md)
+3) [initfsgen](initfsgen.md)
+4) [keygen](keygen.md)
+
+Here a few precisions about the global mecanisms inside each tools:
+- when a tool is iterating on the content of a folder, it rely on the order provided by the filesystem. But tool like `keygen` get there files list through arguments specifying direct files path rather than a folder path, making it a deterministic order if the build script doesn't change
+- when we say 'securely erased', it mean we are using the `explicit_bzero` function to prevent compiler optimization