Update README

Add build and installation instructions to README

README.md

@@ -1,3 +1,11 @@
 # OwlTestRunner
 
-A test runner for it's usage for testing C.
+A test runner for it's usage for testing C.
+
+### Installation instructions
+
+1. Install system package manager build utilities if need-be. (Debian: `sudo apt install -y build-essential`)
+2. Install Perl Build module from system package manager. (Debian: `apt-get install libcpanplus-dist-build-perl`)
+3. Run `cpan build .`
+4. Run `cpan install .`
+