Mention prerequisties in README

Summary:
^

Also removed some emu options, `erl` with my `brew install erlang` didn't have them

Differential Revision: D54950686

fbshipit-source-id: e02f9f0fb4b2a2128d2b151b09ee4cc17d23ec18

BUCK

@@ -65,8 +65,6 @@ erlang_escript(
     emu_args = [
         "+sbtu",
         "+A1",
-        "+JPperf",
-        "true",
     ],
 )
 
@@ -142,10 +140,4 @@ erlang_escript(
     script_name = "example_main",
     deps = [":all_examples"],
     include_priv = True,
-    emu_args = [
-        "+sbtu",
-        "+A1",
-        "+JPperf",
-        "true",
-    ],
 )

README.md

@@ -10,10 +10,14 @@ To read the basic concepts behind the analysis check [finer_taint/README](./fine
 
 ## Getting started
 
-This project is built with [Buck2](https://github.com/facebook/buck2).
+### Install prerequisties
+
+* [Install erlang](https://www.erlang.org/downloads), namely make sure [toolchains/local/erl](./toolchains/local/erl) scripts work
+* This project is built with [Buck2](https://github.com/facebook/buck2).
 Please [install Buck2](https://github.com/facebook/buck2?tab=readme-ov-file#installing-buck2) first.
+* Init submodules: `git submodule update --init --recursive`
 
-Run the simple example
+### Run the simple example
 
 ```
 $ buck2 run @//mode/online_finer_taint :examples  simple