Add SAIL-RISCV binaries with reamde instructions

verif/bin/Readme.md

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+# Pre-build SAIL RISC-V Model Binaries
+
+SAIL RISC-V is the Golden reference model simulator for the formal specification of the RISC-V Architecture. The binaries are build by following the [instructions](https://riscof.readthedocs.io/en/stable/installation.html#install-plugin-models) available in RISCOF documentation. 
+
+These binaries are build for both 32-bit and 64-bit architecture:
+
+- `riscv_sim_RV32`
+- `riscv_sim_RV64`
+
+> :warning: SAIL model binaries must be available in the `$PATH` variable. To do that:
+- Extract `sail-riscv.tar.gz` using
+        
+        tar -xzf sail-riscv.tar.gz sail-riscv
+- Binaries will be extracted in the directory named `sail-riscv`. Export the path of this directory to `$PATH` variable
+
+        export PATH=/path/to/sail-riscv:$PATH