Add README file. Fixed error creating rpm file

sdist: standard file not found: should have one of README, README.rst,
README.txt

README

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+# pygennf
+
+Netflow packets generator with Scape library
+
+* How to install:
+python setup.py install
+
+* How to install the rpm packege:
+rpm -vUh pygennf-0.1-1.noarch.rpm    
+
+# Usage (without installation):
+
+ * You need to install the scapy library:
+ pip install scapy
+
+ * python ./pygennf_v5.py --help
+
+usage: pygennf_v5.py [-h] [-s SRC_IP] [-sp SRC_PORT] [-d DST_IP]
+                     [-dp DST_PORT] [-t TIME_INTERVAL]
+
+UDP packets producer with scapy
+
+optional arguments:
+  -h, --help            show this help message and exit
+  -s SRC_IP, --source-ip SRC_IP
+                        IP source
+  -sp SRC_PORT, --source-port SRC_PORT
+                        Port dst
+  -d DST_IP, --dst-ip DST_IP
+                        IP source
+  -dp DST_PORT, --dst-port DST_PORT
+                        Port dst
+  -t TIME_INTERVAL, --time-interval TIME_INTERVAL
+                        Time interval to wait to send other messages.
+
+# Example of use:
+
+ * Netflow 5:
+ sudo python src/pygennf_v5.py -s 10.0.203.2 -d 10.0.30.89 -t 2
+ * Netflow 9:
+ sudo python src/pygennf_v9.py -s 10.0.203.2 -d 10.0.30.89 -t 2
+ * Netflow 10:
+ sudo python src/pygennf_v10.py -s 10.0.203.2 -d 10.0.30.89 -t 2
+