Add README

Author: kissadamfkut

README.md

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+LibAVRpp
+========
+
+A high-level but efficient C++20 library for your AVR project.
+
+# EEPROM\_var
+
+Accessing variables stored in the EEPROM as they were normal variables. Also support for arrays.
+
+## Example
+Array of function pointers
+```C++
+#include<eeprom_var.hpp>
+
+const avr::eeprom_array animations [[gnu::section(".eeprom")]] = {fade, onoff<1000>, onoff<500>, rotate<1000>};
+
+void function(){
+	const decltype(teszt)::value_type act_anim = teszt[anim_index];
+	act_anim();
+}
+```
+Simple integer in EEPROM (it is accessed through a *'reference'*)
+```C++
+#include<eeprom_var.hpp>
+
+const uint16_t example [[gnu::section(".eeprom")]] = 7;
+
+void function(){
+	avr::eeprom_ref example_ref {&example};
+	uint16_t a = 5 + example_ref;
+}
+```
+