Add HiSilicon/SigmaStar compatibility table

compat.md

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+## SigmaStar and HiSilicon SoCs
+
+This table has been [translated by CNX Software](
+https://www.cnx-software.com/2021/05/05/sigmastar-ssc33x-camera-soc-pin-to-pin-compatible-hisilicon-hi3516-hi3518/),
+originally taken from [16RD.com BBS](http://bbs.16rd.com/thread-568161-1-1.html).
+
+
+Processor | Cortex A7 | Emb. RAM | Camera (res@FPS) | AI Accel | Proc | Compat. SoC |
+--------- | --------- | -------- | ---------------- | -------- | ---- | ----------- |
+SSC333    | 1x        | 512 Mbit | 1080p@30, 3MP@20 |   None   | 28nm | Hi3518EV300 |
+SSC335    | 1x        | 512 Mbit |     3MP@30       |   None   | 28nm | Hi3518EV200 |
+SSC333D   | 1x        |   1 Gbit | 1080p@30, 3MP@20 |   None   | 28nm |             |
+SSC335D   | 1x        |   1 Gbit |     3MP@30       |   None   | 28nm |             |
+SSC337D   | 1x        |   1 Gbit | 1080p@60, 5MP@20 |   None   | 28nm | Hi3516EV300 |
+SSC336D   | 2x        |   1 Gbit |     3MP@30       | 0.5 TOPS | 22nm | Hi3516CV500 |
+SSC336Q   | 2x        |   2 Gbit |     3MP@30       | 0.5 TOPS | 22nm | Hi3516CV500 |
+SSC338Q   | 2x  (TBC) |   2 Gbit |      4K@20       | 0.5 TOPS | 22nm | Hi3516DV300 |
+SSC338G   | 2x  (TBC) |   None   |      4K@20       |   1 TOPS | 22nm | Hi3516DV300 |
+SSC339G   | 2x  (TBC) |   None   |      4K@30       |   1 TOPS | 22nm |             |