Updated README, that was a copy of another one.

README.md

-# Utilities to generate stats and graphs from reads.
-
-This is a very preliminary version, with very few utilities.
+# Utilities to collapse reads in bam files to their 5' end.
 
 
 ## Installing
 
-Get the source using `git clone git@gitlab.pasteur.fr:bli/libreads.git`, `cd` into it and run `python3 -m pip install .`
+Get the source using `git clone git@gitlab.pasteur.fr:bli/bam25prime.git`, `cd` into it and run `python3 -m pip install .`
 
 It might also work directly:
 
-    python3 -m pip install git+ssh://git@gitlab.pasteur.fr/bli/libreads.git
+    python3 -m pip install git+ssh://git@gitlab.pasteur.fr/bli/bam25prime.git
+
+## Usage
+
+This package provides a `bam25prime`.
+Its help can be obtained using option `-h` or `--help`.
+
+```
+$ bam25prime --help
+usage: bam25prime [-h] -b BAMFILE -o OUT_BED
+
+When executed, this module collapses reads in a bam file to their 5-prime end
+(reducing them to length 1) and writes the result in bed format.
 
+optional arguments:
+  -h, --help            show this help message and exit
+  -b BAMFILE, --bamfile BAMFILE
+                        Sorted and indexed bam file containing the aligned
+                        reads. (default: None)
+  -o OUT_BED, --out_bed OUT_BED
+                        Bed file in which the results should be written.
+                        (default: None)
+```