Move install info to README from separate file

INSTALL

@@ -1,17 +0,0 @@
-You need the following utilities to run rpmlint:
-	o python 2.7 or newer
-	o rpm and its python bindings
-	o libmagic and its python bindings (optional)
-	o readelf
-	o cpio
-	o desktop-file-validate
-	o gzip, bzip2 and xz
-	o groff and gtbl (optional)
-	o enchant and its python bindings (optional)
-	o appstream-util, part of appstream-glib (optional)
-
-and the following programs to install it:
-	o python 2.7 or newer
-	o python-setuptools
-	o rpm python bindings
-	o pytest and pytest-flake8 (for running the test suite)

README.md

@@ -20,19 +20,39 @@ checks and suggestions at:
 
 https://github.com/rpm-software-management/rpmlint
 
-# Testing
+## Install
+
+For installation on your machine you will need following packages:
+
+- Python 3.6 or newer
+- Python setuptoools
+- rpm and its python bindings
+- readelf, cpio, gzip, bzip and xz
+- libmagic and its python bindings (optional)
+- groff and gtbl (optional)
+- enchant and its python bindings (optional)
+- appstream-util, part of appstream-glib (optional)
+
+## Testing
 
 If you want to test the rpmlint when developing best is to use docker
 to provide the enviroment for you. There are various distribution
 dockerfiles in `test/` folder.
 
-Ie. on openSUSE you can test using following commands.
-
-First you build the docker enviroment:
+Ie. if you want to test on latest openSUSE you can test using following commands:
 
 `docker build -t opensusetw -f test/Dockerfile-opensusetw .`
+
 `docker run -v $(pwd):/usr/src/rpmlint/ opensusetw python3 setup.py test`
 
+Another option is to run the tests on your system directly. If you
+have all the required modules as listed on the Install section above.
+You will also need `pytest` and `pytest-cov` and `pytest-flake8`.
+
+If all the dependencies are present you can just execute tests using:
+
+`python3 setup.py test`
+
 ## Configuration
 
 If you want to change configuration options or the list of checks you can