README: Add table of contents

README.md

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 - This repository is mainly for my personal school work in Haaga-Helia University of Applied Sciences related to central management of multiple servers (master/slave model), focusing mainly on Linux environment. It includes exercises which follow file name syntax h1.md h2.md .. (h = harjoitus = meaning "exercise" in finnish language).
 
 - Texts in the exercices are written in finnish as the task definitions are presented in finnish on the course these exercices have been done for.
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+-------------------------
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+# Table of contents
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+- [Exercise 1](https://github.com/Fincer/central-management-of-multiple-servers/blob/master/h1.md)
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+- [Exercise 2](https://github.com/Fincer/central-management-of-multiple-servers/blob/master/h2.md)
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+- [Exercise 3](https://github.com/Fincer/central-management-of-multiple-servers/blob/master/h3.md)
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+- [Exercise 4](https://github.com/Fincer/central-management-of-multiple-servers/blob/master/h4.md)
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+- [Exercise 5](https://github.com/Fincer/central-management-of-multiple-servers/blob/master/h5.md)
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+- [Exercise 6](https://github.com/Fincer/central-management-of-multiple-servers/blob/master/h6.md)
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+- [Course module](https://github.com/Fincer/central-management-of-multiple-servers/blob/master/module.md)