Update README.md

README.md

@@ -33,6 +33,7 @@ git checkout hpvm-release
 
 HPVM installer script can be used to download, configure and build HPVM along with LLVM and other subprojects including Clang. 
 ```shell
+cd hpvm
 bash install.sh
 ```
 Specifically, the HPVM installer downloads LLVM, Clang, compiler-rt, libcxxabi and lld, copies HPVM source into 
@@ -45,7 +46,8 @@ The default number of threads used to build HPVM is 2.
 
 Alternatively, CMake can be run manually.
 ```shell
-cd hpvm/build
+mkdir build
+cd build
 cmake ../llvm [options]
 ```
 Some common options that can be used with CMake are: