Add `jemalloc` dependency to README

[IronGauntlets]

[aminsato]

Do you mean how to install Jemalloc dependencies, like brew insall pkg-config?

[PhilippeR26]

It was straightforward to build juno from source in the previous versions. But seems complicated to build 0.9.4. I have :

> brew list
binutils  gcc  gmp  isl  jemalloc  libmpc  lz4	mpfr  pkg-config  xz  zlib  zstd

make juno works without error, but when launching :

./build/juno: error while loading shared libraries: libjemalloc.so.2: cannot open shared object file: No such file or directory

Could be useful to have a more detailed Build and Run chapter in the README file, made for a fresh computer.

Temporarily, I came back to 0.9.3 build.

[stefanalfbo]

I made a PR on the extra steps I needed to do to be able to build the project.

[PhilippeR26]

Nice. These instructions are working for me.

[IronGauntlets]

closed by #1739