Update README.rst about installation and running

README.rst

@@ -11,7 +11,7 @@ Contents
 ========
 
 * `Dependency <#dependency>`_
-* `Running <#running>`_
+* `Install and Run <#running>`_
 
   * `JSON logging <#json-logging>`_
 
@@ -60,15 +60,23 @@ Dependency
 
 - All commands used in your version source files
 
-Running
-=======
+Install and Run
+===============
+To install::
+
+  pip3 install nvchecker
+
+To use the latest code, you can also clone this repository and run::
+
+  python3 setup.py install
+
 To see available options::
 
-  ./nvchecker --help
+  nvchecker --help
 
 Run with one or more software version source files::
 
-  ./nvchecker source_file
+  nvchecker source_file
 
 You normally will like to specify some "version record files"; see below.
 
@@ -106,11 +114,11 @@ Version record files record which version of the software you know or is availab
 
 Say you've got a version record file called ``old_ver.txt`` which records all your watched software and their versions, as well as some configuration entries. To update it using ``nvchecker``::
 
-  ./nvchecker source.ini
+  nvchecker source.ini
 
 See what are updated with ``nvcmp``::
 
-  ./nvcmp source.ini
+  nvcmp source.ini
 
 Manually compare the two files for updates (assuming they are sorted alphabetically; files generated by ``nvchecker`` are already sorted)::