Add table of contents

Author: nflaig

README.md

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 # loopback4-cosmosdb-retry
 
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 LoopBack 4 data source mixin to handle database operation retries in case of Azure Cosmos DB request
 limit errors caused by exceeding the available [Request Units][request-units].
 
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+## Contents
+
+- [Prerequisites](#prerequisites)
+- [Installation](#installation)
+- [Usage](#usage)
+- [Configuration](#configuration)
+- [Related resources](#related-resources)
+- [Contributing](#contributing)
+- [License](#license)
+
 ## Prerequisites
 
 Some dependencies need to be installed as peer dependencies