Added some documentation

README

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+                                ACED PROJECT
+
+This repository is (part of) my work for the ``Arquitecturas de Elevado
+Desempenho'' class. See the doc/proposal.pdf document for more information on
+the problem statement.
+
+
+[[Project Structure]]
+
+root
+ ├ aux          Auxiliary scripts.
+ ├ contrib      External C libraries.
+ ├ data         Data for use as input or embedding in source.
+ ├ doc          Extra documentation related to the project.
+ ├ includes     Header files.
+ ├ obj          Compiled object files.
+ └ src          Root project source files.
+ 
+The directory is essentially a C project, with auxiliary documentation and
+scripts. The main executable can be compiled by running the corresponding
+[sane] recipe:
+
+    python3 make.py compile
+
+This will produce a main.exe executable in the root directory.
+See all available recipes by running
+
+    python3 make.py --list
+
+and read more about [sane]: at https://github.com/mikeevmm/sane.
+
+
+[[Use Instructions]]
+
+To use, pipe the input (structured according to the source specification) into
+the executable. E.g.,
+
+    cat data/test_mat.txt | ./main.exe