Add RiscV Vector 1.0 specification

One needs to build this pdf from source in order to view normally.
Adding binary for team reference.

This doc has really great tables for viewing sections of opcodes,
as well as in depth explanations of the opcode fields.

Change-Id: Ia7b9ba7d47c6e038fdf04633b7e295890748b3cc
diff --git a/riscv-v-spec.pdf b/riscv-v-spec.pdf
new file mode 100644
index 0000000..bdcb7a2
--- /dev/null
+++ b/riscv-v-spec.pdf
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