Change implementation language to PHP for ZATCA's E-Invoicing require…

…ments

README.md

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   <p>
-    An implementation of Saudi Arabia ZATCA's E-Invoicing requirements, processes, and standards in TypeScript. <br/>
+    An implementation of Saudi Arabia ZATCA's E-Invoicing requirements, processes, and standards in PHP. <br/>
   </p>
   Read the <a href="/docs">documentation PDFs</a> or <a href="https://zatca.gov.sa/en/E-Invoicing/SystemsDevelopers/Pages/TechnicalRequirementsSpec.aspx">Systems Developers</a> for more details.
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