Add README.md

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+## Adding new source files
+Be free to add new source files! After adding files, it must be runned this
+script:
+```
+$ ./makemk
+```
+So will be generated a new `target.mk`. This one must be committed, to avoid
+running `makemk` on cloning repository.
+
+## Build instruction
+It's simple, just:
+```
+$ make
+```