Merge pull request #649 from pallene-lang/update-readme

Update README to include Pallene Tracer build instructions

Author: hugomg

README.md

@@ -34,6 +34,21 @@ It needs to say `Lua 5.x.x with core API`.
 If it doesn't have the "with core API",
 that means you're using the default Lua instead of the special Lua.
 
+### Install Pallene Tracer
+
+For debugging purposes, Pallene uses a tool called Pallene Tracer, which is required to trace function calls throughout
+Pallene and Lua environments. You must clone and compile Pallene Tracer from its repository
+[pallene-tracer](https://github.com/pallene-lang/pallene-tracer). You need to use a specific version, `0.5.0a`.
+
+```sh
+git clone https://www.github.com/pallene-lang/pallene-tracer --depth 1 --branch 0.5.0a
+cd pallene-tracer
+make LUA_PREFIX=/usr/local
+sudo make install
+```
+
+Here, `LUA_PREFIX=/usr/local` is used to point to the patched Lua for Pallene.
+
 ### Install Luarocks
 
 The next step is to get the Luarocks package manager.
@@ -66,10 +81,6 @@ Remember that in order for the local rocks tree to work, you must to set the PAT
 eval "$(luarocks path)"
 ```
 
-### Install the Pallene Tracer
-
-Refer to the README at https://github.com/pallene-lang/pallene-tracer
-
 ### Install Pallene
 
 Finally, we can use Luarocks to build and install the Pallene compiler.