improved instructions to install (#2)

README.md

@@ -7,4 +7,17 @@ For more information on frida, see https://www.frida.re/docs/android/.
 
 ## Instructions
 
-Flash the zip for your platform using TWRP or Magisk Manager.
+Flash the zip for your platform using TWRP or Magisk Manager.
+
+You can either grab the zip file from the [release page](https://github.com/AeonLucid/MagiskFrida/releases) or build it yourself.
+
+In order to build it:
+
+```
+git clone https://github.com/AeonLucid/MagiskFrida
+cd MagiskFrida
+pip3 install -r requirements.txt
+python3 build.py
+```
+
+Two zip files will be generated in the same folder, grab the right architecture.