Create landing pages for PSA Crypto and for each driver type
There isn't much content yet, we'll populate it over time as the
interface stabilizes and as more material becomes available.
diff --git a/docs/psa/se/index.md b/docs/psa/se/index.md
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+# PSA secure element driver interface
+
+The accelerator interface lets you drivers for external cryptoprocessors into an implementation of the [PSA Cryptography API](../#application-programming-interface). External cryptoprocessors such as secure elements and smart cards perform cryptographic operations with keys accessed via opaque handles.
+
+**Status: draft** — major changes are still likely.
+
+**Documentation**: for now, please see the header file:
+[`include/psa/crypto_se_driver.h`](https://github.com/ARMmbed/mbed-crypto/blob/development/include/psa/crypto_se_driver.h)