added argument parser, updated readme

README.md

@@ -2,7 +2,7 @@
 
 contact: francesco.tomba@phd.units.it
 
-# USAGE
+# Usage
 Clone the repository and compile with `make`
 The compilation process produces an executable called `main`, run it with `mpirun`
 The suggestion is to run it with one mpi task per socket.
@@ -13,7 +13,7 @@ The suggestion is to run it with one mpi task per socket.
  - -o --out-data       *(optional)* output path for the data, the datafile is shuffled between mpi tasks and datapoints are ordered default is `out_data`
  - -a --out-assignment *(optional)* output path for the cluster assignment output ranges [0 ... Nc - 1] for core points halo points have indices [-Nc ... -1] conversion of idx for an halo point is `cluster_idx = -halo_idx - 1`, default is `out_assignment`
 
-# TODO
+# Todo
 
  - [x] ~~arugment parser~~
  - [ ] prettify overall stdout