Improve README

Author: jecisc

README.md

@@ -12,6 +12,35 @@
   </p>
 </p>
 
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+[![CI](https://github.com/PolyMathOrg/PolyMath-DataStructures/actions/workflows/test.yml/badge.svg)](https://github.com/PolyMathOrg/PolyMath-DataStructures/actions/workflows/test.yml)
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+
+## Description
+
+A project to manage the data structures of PolyMaths. It currently includes the Vector and Matrix Pharo implementation.
+
+## Installation
+
+You can load all the packages into a fresh Pharo image by going to the Playground (Ctrl + OW/Cmd + OW) and executing the following expression (select it and press Do-it button or Ctrl+D/Cmd+D):
+
+```smalltalk
+    Metacello new
+        baseline: 'PolyMathDataStructures';
+        repository: 'github://PolyMathOrg/PolyMath-DataStructures/src';
+	onWarningLog;
+	onConflictUseIncoming;
+        load ]
+```
+
+This should load the default version of the project (you can also specify another version or branch).
+
+To add it to your Baseline:
+
+```smalltalk
+    spec
+	    baseline: 'PolyMathDataStructures'
+	    with: [ spec repository: 'github://PolyMathOrg/PolyMath-DataStructures/src' ]
+```
+
+If you are new to baselines and Metacello, check out the [Baselines](https://github.com/pharo-open-documentation/pharo-wiki/blob/master/General/Baselines.md) tutorial on Pharo Wiki.