Update README.md

README.md

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-Edit this `README.md` markdown file to author your organization card.
+# RealTimeData
+
+We collect **the latest texts** from the web. Our sources are updated normally monthly to provide you the most up-to-date materials from the web.
+
+We now maintain four sources:
+
+- arXiv
+- BBC.com news
+- Reddit
+- Github
+
+All these sources are widely considered as **time-sensitive** sources.
+
+Let us know if you want any other sources to be included.