Add images for README
diff --git a/docs/source/_static/secure_memory.png b/docs/source/_static/secure_memory.png
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diff --git a/docs/source/_static/trng.png b/docs/source/_static/trng.png
new file mode 100644
index 0000000..08243c2
--- /dev/null
+++ b/docs/source/_static/trng.png
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