Create AVR_CLI.md

Author: arteknix

LearningAvrC/Examples/Lesson00/AVR_CLI.md

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+# How to code from Terminal
+
+>[!TIP]
+> Copy `blink.c` and `Makefile` to a folder (eg. **\<your dev folder\>/AVR_C/Lesson00**)
+>
+> ***edit Makefile*** to adapt PRGMER to your case/port
+>
+> open terminal there and\
+> go `make <TAB> <TAB>` to see possible targets
+> 
+> Finally : `make` or `make upload`
+
+>[!NOTE]
+> I piped the `avr-readelf` output through `less` for readability