readme: Add components fetching section

Signed-off-by: Ahmed Ismail <[email protected]>
FreeRTOS · May 7, 2024 · 41c4e5c · 41c4e5c
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@@ -106,6 +106,10 @@ of the verification fails, then MCUBoot stops the booting process.
 
 ## Software Components
 
+### Fetching
+
+Generally all the components used within the FRI project are fetched using `git submodules` from their official repositories into `components/` directory. Exact location and the version are recorded in the [manifest.yml](manifest.yml).
+
 ### Trusted Firmware M
 
 Trusted Firmware-M (TF-M) implements the Secure Processing Environment (SPE)