docs: update readme

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-# load-so
+# sotest
 
 A tiny interpreter for loading and testing shared libraries.
 
 ## Installation
 
+You'll need a C compiler and CMake installed.
+
+```
+git clone https://github.com/aloussase/sotest
+cd sotest
+cmake -B build -S .
+cmake --build build
+```
+
 ## Usage
 
+To spawn a REPL:
+
+```
+./build/sotest
+```
+
+To evaluate the contents of a file:
+
+```
+./build/sotest/<filename>
+```
+
 ## Demo