Update README.md

README.md

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 ## APIs
 
+- `DocFinder` : Search technical documents from 3GPP / ETSI by their ID or using keywords ([documentation](https://organizedprogrammers-docfinder.hf.space/))
 - `3GPPDocFinder` : Search 3GPP technical documents and specifications by their ID or using keywords. ([documentation](https://organizedprogrammers-3gppdocfinder.hf.space/docs))
 - `3GPPSpecSplitter` : Retrieve contents of 3GPP specifications (don't work with technical documents). ([documentation](https://organizedprogrammers-3gppspecsplitter.hf.space/))
 - `ETSIDocFinder` : Searched ETSI documents by their ID.  ([documentation](https://organizedprogrammers-etsidocfinder.hf.space/docs))