Updated readme

README.md

-[![Build Status](https://travis-ci.org/PDB-REDO/libcifpp.svg?branch=trunk)](https://travis-ci.org/PDB-REDO/libcifpp)
-
 libcifpp
 ========
 
 This library contains code to work with mmCIF and PDB files.
 
-
 Requirements
 ------------
 
 The code for this library was written in C++17. You therefore need a
 recent compiler to build it. For the development gcc 9.3 and clang 9.0
-have been used.
+have been used as well as MSVC version 2019.
 
 Other requirements are:
 
-- GNU make version 4.1 or higher.
-- Boost libraries, at least version 1.71
+- Boost libraries, at least version 1.70
 - [mrc](https://github.com/mhekkel/mrc), a resource compiler that
   allows including data files into the executable making them easier to
-  install. Strictly this is optional, but at the expense of a lot of
-  functionality.
+  install. Strictly this is optional, but at the expense of functionality.
 
 Building
 --------
 
-Simply configure, make and make install.
+This library uses [cmake](https://cmake.org). The usual way of building
+and installing is to create a `build` directory and run cmake there.
+
+On linux e.g. you would issue the following commands:
+
+```
+	git clone https://github.com/PDB-REDO/libcifpp.git
+	cd libcifpp
+	mkdir build
+	cd build
+	cmake ..
+	cmake --build . --config Release
+	ctest -C Release
+	cmake --install .
+```
+This checks out the source code from github, creates a new directory
+where cmake stores its files. Run a configure, build the code and run
+tests. And then it installs the library and auxiliary files.
+
+The default is to install everything in `$HOME/.local` on Linux and
+`%LOCALAPPDATA%` on Windows (the AppData/Local folder in your home directory).
 
-There's one configure flag that might be of interest: if you specify
-DEBUG=1 the make will create a debug version by default. Otherwise,
-you can run make with DEBUG=1 to create a debug version.