Update README.md

README.md

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 ```node
 npm install
 npm run dev
-```
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+```
+
+## Contents:
+1. Scatterplot with filter by level and tooltip
+1. LineChart with filter by starting year and tooltip
+1. Using abstract class `chart.ts` and factory pattern based on map in `chartFactory.ts` and `chartsNames.ts`files
+1. `main.ts` file does not depent on any strictly typed chart
+
+## Future improvements:
+- Add `register` method to Charts in order to achieve Open-closed principle in `chartFactory` class
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