Create README.en.md

Author: szepeviktor

README.en.md

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+# VoIP
+
+☢️ Telephony without microwaves
+
+### Motivation
+
+1. Mobile phones have a microwave transmitter with a range of 10 km
+2. The computer can handle telephony (copy-paste, `tel:` URLs)
+3. With microphones in [webcams](https://www.logitech.com/en-us/products/webcams.html)
+   and external speakers, you can free your hands and even walk away a few meters
+
+### Service provider
+
+[N-System Távközlési Kft.](https://n-system.hu/)
+
+- 🆘 Can be used for emergency calls: `112`
+- Standard SIP protocol, use any [SIP client](https://www.microsip.org/)
+- [ACE Telekom Ltd.'s network](https://bgp.he.net/AS50261)
+- There is caller ID send/receive
+- Abbreviated numbers can be called
+- Blue and green numbers can be called
+- ❌ SMS sending/receiving not possible