add 3d_gpu roadmap

diff --git a/3d_gpu/roadmap.mdwn b/3d_gpu/roadmap.mdwn
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+* check with the RISC-V LLVM backend maintainer and
+  * if they aren't going to complete the RV64GC codegen support soon,
+  * start working on adding support for RV64GC codegen based on
+    https://github.com/lowRISC/riscv-llvm using
+    https://github.com/andestech/riscv-llvm/tree/riscv-release_50/lib/Target/RISCV
+    for reference.
+* Add support for RV64GC on Linux to Rust in order to write the user-space
+  graphics driver in Rust, I can start by using andestech/riscv-llvm if
+  not implementing RV64GC for LLVM
+* Implement Simple-V support in Spike
+* Add Linux support for Simple-V & Asymmetric Multi Processing
+* Implement Simple-V support in LLVM & wire up Rust's SIMD to support it
+* Start working on the HW design & figure out the remainder of the plan