Add a README file.

Signed-off-by: Thiago Macieira <[email protected]>

Author: thiagomacieira

README

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+Concise Binary Object Representation (CBOR) Library
+---------------------------------------------------
+
+To build TinyCBOR:
+
+  make
+
+If you want to change the compiler or pass extra compiler flags:
+
+  make CC=clang CFLAGS="-m32 -Oz" LDFLAGS="-m32"
+
+Documentation: https://01org.github.io/tinycbor/current/
+