Add README with summary

Author: plutoo

README.md

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+### Summary
+
+These are just random notes taken by me (plutoo) and naehrwert mostly when we
+first looked into the Wii U. yellows8, smea and derrek also made contributions.
+
+### Things
+
+A few things that might be interesting:
+
+* [System flaws](notes/system_flaws.txt)
+* [OTP notes](notes/io/otp.txt)
+* [IOSU memory map](notes/arm_memorymaps/virt_phys.txt)
+* [IOSU syscall table](notes/arm_kernel/syscalls.txt)
+* [/dev/crypto key table](notes/arm_ios/dev_crypto.txt)
+* [PowerPC memory map](notes/ppc_kernel/memory_maps.txt)
+* [PowerPC syscall table](notes/ppc_kernel/syscalls.txt)
+* ...
+
+### Tools
+
+* [Firmware downloader and extractor](dld.py)
+* [Ancast image decryptor](dec_ancast.py)
+* [Amiibo crypto algo](amiibo_crypto.c)