add faq

docs/concepts/faq.md

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+# FAQ
+
+A series of common questions people have about Slate:
+
+- [How come content is pasted as plain text?](#how-come-content-is-pasted-as-plain-text)
+
+
+#### How come content is pasted as plain text?
+
+One of Slate's core principles is that, unlike most other editors, it does **not** prescribe a specific "schema" to the content you are editing. This means that Slate's core has no concept of "block quotes" or "bold formatting". 
+
+For this most part, this leads to increased flexbility without many downsides, but there are certain cases where you have to do a bit more work. Pasting is one of those cases.
+
+Since Slate knows nothing about your schema, it can't know how to parse pasted HTML content (or other content). So, by default whenever a user pastes content into a Slate editor, it will parse it as plain text. If you want it to be smarter about pasted content, you need to define an [`onPaste`](../reference/components/editor.md#onpaste) handler that parses the content as you wish.