opensbi: Added

opensbi/slack-desc

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+# HOW TO EDIT THIS FILE:
+# The "handy ruler" below makes it easier to edit a package description. Line
+# up the first '|' above the ':' following the base package name, and the '|'
+# on the right side marks the last column you can put a character in. You must
+# make exactly 11 lines for the formatting to be correct. It's also
+# customary to leave one space after the ':'.
+
+       |-----handy-ruler------------------------------------------------------|
+opensbi: opensbi (RISC-V Open Source Supervisor Binary Interface)
+opensbi:
+opensbi: The goal of the OpenSBI project is to provide an open-source reference
+opensbi: implementation of the RISC-V SBI specifications for platform-specific
+opensbi: firmwares executing in M-mode. An OpenSBI implementation can be easily
+opensbi: extended by RISC-V platform and system-on-chip vendors to fit a
+opensbi: particular hardware configuration.
+opensbi:
+opensbi:
+opensbi:
+opensbi: