Update README.md

README.md

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-# scpi_parser
-SCPI C implementation for embedded devices
+# SCPI parser
+
+This library provides a simple ("KISS") SCPI implementation for embedded devices (instruments).
+
+The implementation is not 100% complete, but it's sufficient for basic SCPI communication.
+
+## What's supported
+
+- The hierarchical header model (commands with colon)
+- Semicolon for chaining commands on the same level
+- String, Int, Float, Bool arguments
+- Block data argument with callback each N received bytes (configurable)
+- Status Register model
+- Error queue including error messages from the SCPI spec
+- All mandatory SCPI commands (headers) are implemented as built-ins
+
+Built-in commands can be overriden in user command array.
+
+See main.c for example of how to use the library.
+
+## What is missing
+
+
+