Added README.md

README.md

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+# Secondary Bootloader (SPL) for baremetal NextVOD box
+
+As the EMI SPI interface only accepts 32 bit accesses,
+a secondary bootloader is required for code memory (for now).
+
+This bootloader will:
+* Initialize LMI(DDR2) memory
+* Configure caches
+* Find the text size from a descriptor(see below)
+* Load and execute the application code from LMI.
+
+## Application descriptor
+
+| Offset | Content |
+|-|-|
+| 0x00 | text length |
+| 0x04 | entry point |
+
+## Project status
+TODO
+
+## Partition scheme
+> Currently 32kB Flash is planned for SPL.