Improve README & add a CHANGELOG

CHANGELOG.md

@@ -0,0 +1,30 @@
+# Changelog
+
+## v1.3.0
+
+- add a program to test integration
+- support electronic hardware v1 **and** v2
+  (_v1 by default, v2 through a config flag_)
+- implement start/stop
+  (_from now on, machine will begin stopped!_)
+- handle Emerson valves
+  (_through a config flag_)
+- improve the way buzzer is controlled
+
+## v1.2.3
+
+- fix an issue with buzzer (sometimes it was stuck buzzing whereas no alarm were triggered)
+- add battery-related alarms
+
+## v1.2.2
+
+- handle several pneumatic systems
+  _(for the first 2 working typologies of prototype)_
+
+## v1.2.1
+
+_Unreleased_
+
+## v1.2.0
+
+First release version

README.md

@@ -2,9 +2,9 @@
 
 ## Versions
 
-| Version | Last Changelog | Ready? |
-| ------- | -------------- | ------ |
-| V1.1.x | Initial test working | ✅
+See [CHANGELOG.md](CHANGELOG.md).
+
+Pre-compiled binaries are available in the [Releases](https://github.com/covid-response-projects/covid-respirator/releases) section.
 
 ## Documentation
 
@@ -13,3 +13,9 @@ Code documentation can be [found there](https://covid-response-projects.github.i
 ## How To Build?
 
 In order to setup your environment and build the code, please follow the commands contained in the "[software-release](/.github/workflows/software-release.yml)" GitHub Actions file.
+
+### Configuration
+
+High level configuration options are available and documented in [includes/config.h](includes/config.h).
+
+Low level configuration options can be found in [includes/parameters.h](includes/parameters.h).