add slides from @RoboTux

Link: #22

Author: nickdesaulniers

README.md

@@ -17,7 +17,7 @@ with a focus on configuration, testing, and unique constraints.
 | 09:25 | [Homebrew LLVM](https://github.com/ClangBuiltLinux/llvm-distributors-conf-2021/issues/21) | Carlo Cabrera |||
 | 09:40 | [Switching to LLVM based toolchains in Yocto based distributions](https://github.com/ClangBuiltLinux/llvm-distributors-conf-2021/issues/8) | Bernhard Rosenkraenzer (Huawei) |||
 | 09:55 | [The LLVM embedded toolchain for Arm](https://github.com/ClangBuiltLinux/llvm-distributors-conf-2021/issues/17) | Peter Smith (ARM) |||
-| 10:10 | [Graphcore IPU LLVM toolchain & libraries](https://github.com/ClangBuiltLinux/llvm-distributors-conf-2021/issues/22) | Thomas Preud'homme (Graphcore) |||
+| 10:10 | [Graphcore IPU LLVM toolchain & libraries](https://github.com/ClangBuiltLinux/llvm-distributors-conf-2021/issues/22) | Thomas Preud'homme (Graphcore) | [link](https://raw.githubusercontent.com/ClangBuiltLinux/llvm-distributors-conf-2021/main/slides/graphcore.pdf) ||
 | 10:25 | break ||||
 | 10:40 | [LLVM toolchains in Nixpkgs](https://github.com/ClangBuiltLinux/llvm-distributors-conf-2021/issues/20) | John Ericson (Obsidian Systems) |||
 | 10:55 | [Building, Testing, and Distributing Chromium's C++ Toolchain](https://github.com/ClangBuiltLinux/llvm-distributors-conf-2021/issues/10) | Hans Wennborg (Google) |||