Add documentation based on docusarus for opendbm

docs/docs/sentiment-of-speech.md

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+---
+id: sentiment-of-speech
+title: Sentiment of Speech
+---
+
+This refers to the emotional valence of the transcribed text based. This determination is based on pre-trained models found in the [vaderSentiment](https://pypi.org/project/vaderSentiment/    ) library. Positive values of sentiment indicate positive emotional valence, while negative values indicate negative emotional valence.
+
+## Derived Variables
+
+| Variable      | Description |
+| ----------- | ----------- |
+| `nlp_sentiment_mean_mean`      | **Sentiment of speech**, ranging from -1 to 1, with -1 indicative negatively valenced speech and +1 indicative positively valenced speech.    |