Update readme

Author: radare

README

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+spp
+===
+
+SPP stands for Simple Pre-Processor.
+
+Author: pancake <pancake<at>nopcode<dot>org>
+License: MIT
+
+Configuration
+-------------
+SPP binary can be configured by changing the values in the config.h file, this way you can specify which preprocessors you want to include in the parser.
+
+	# Edit the config.h file before typing 'make'
+
+Build
+-----
+	$ make
+
+Installation
+------------
+
+	$ make install PREFIX=/usr