Add external services

README.md

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 ### Why Forli?
 The first settlement of the ancient Roman Forum was built in approximately 188 BC by consul *Gaius Livius Salinator*, who gave it the Latin name *Forum Livii*, meaning "the place of the gens Livia".
 
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 ### Installation Guide (Please follow links)
 
 Forli requires:
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 The Rails API server runs in `port: 4000`
 
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 ### Frontend Setup
 
 Clone the Repo:
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 The Ember frontend server runs in `port: 5050`. Once `ember serve` command starts, go to: [`http://localhost:5050`](http://localhost:5050)
 
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 ### Metrics
 
 The Sidekiq Web runs along with the Rails API server. To view the dashboard, go to: [`http://localhost:4000/sidekiq`](http://localhost:4000/sidekiq)
 
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+### External Services
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+- [`Akismet`](https://akismet.com) for Spam Filtering
+- [`Algorithmia`](https://algorithmia.com/algorithms/nlp/SentimentAnalysis) for Sentiment Analysis
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 ### Docker
 ```sh
 $ docker-compose build