Add README

README.md

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+# Universal-Sierra-Compiler
+
+Universal-Sierra-Compiler is the tool for Sierra compilation. It compiles any ever-existing Sierra version to CASM.
+
+| Supported Sierra Versions |
+|---------------------------|
+| ~1.4.0                    |
+| ~1.3.0                    |
+| ~1.2.0                    |
+| 1.1.0                     |
+| 1.0.0                     |
+| 0.1.0                     |
+
+## Usage
+
+To use the tool, just pass a path to a file with Sierra in json format:
+
+```shell
+$ universal-sierra-compiler \
+  --sierra-input-path ./path/to/sierra.json
+
+{"bytecode": ...}
+```
+
+> 📝 **Note**
+> 
+> Please, note that the output is in the JSON format.
+
+To automatically save CASM, pass `casm-output-path` argument:
+
+```shell
+$ universal-sierra-compiler \
+  --sierra-input-path ./path/to/sierra.json
+  --casm-output-path ./path/to/casm.json
+```