Add terraform slides

Signed-off-by: Arnaud Morin <arnaud.morin@ovhcloud.com>

terraform/slides/plugin/markdown/example.md

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+# Markdown Demo
+
+
+
+## External 1.1
+
+Content 1.1
+
+Note: This will only appear in the speaker notes window.
+
+
+## External 1.2
+
+Content 1.2
+
+
+
+## External 2
+
+Content 2.1
+
+
+
+## External 3.1
+
+Content 3.1
+
+
+## External 3.2
+
+Content 3.2