Add 'ClinicalTrials'

ClinicalTrials.md

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+## Current data
+
+[ClinicalTrials.gov](https://clinicaltrials.gov/ct2/resources/download) data can be downloaded.
+
+
+Most of the data is available at [CTTI](https://aact.ctti-clinicaltrials.org/) in a Relational DB.
+
+## Historical Data
+
+Historical data is available through a custom API (only available to CBO for their project) and on the web page.