Create examples.md (#763)

* Create examples.md

Summarize Sui code samples for easy reference and findability

* Update doc/src/explore/examples.md

Co-authored-by: Sam Blackshear <sam@mystenlabs.com>

* Update doc/src/explore/examples.md

Co-authored-by: Sam Blackshear <sam@mystenlabs.com>

* Update doc/src/explore/examples.md

Co-authored-by: Sam Blackshear <sam@mystenlabs.com>

* Update doc/src/explore/examples.md

Co-authored-by: Sam Blackshear <sam@mystenlabs.com>

* Update doc/src/explore/examples.md

Co-authored-by: Sam Blackshear <sam@mystenlabs.com>

* Update doc/src/explore/examples.md

Co-authored-by: Sam Blackshear <sam@mystenlabs.com>

Co-authored-by: Sam Blackshear <sam@mystenlabs.com>

doc/src/explore/examples.md

@@ -0,0 +1,27 @@
+---
+title: Examples of Sui Smart Contracts
+---
+
+Find sample Sui smart contract implementations in the [sui_programmability/examples](../../../sui_programmability/examples) directory. Here is a rundown of existing examples.
+
+## Basics
+
+Use the [Basics](../../../sui_programmability/examples/basics) example to explore object creation, update, and exchange.
+
+## DeFi
+
+In the [DeFi](../../../sui_programmability/examples/defi) example, find an atomic swap leveraging an escrow agent that is trusted for liveness, but not safety.
+
+## Fungible Tokens
+
+In the [Fungible Tokens](../../../sui_programmability/examples/fungible_tokens) example, see a token managed by a treasurer trusted for minting and burning for
+how (e.g.) a fiat-backed stablecoin would work.
+
+## Games
+
+The [Games](../../../sui_programmability/examples/games) example lets you try out and modify toy games built on top of Sui! These include classic Tic Tac Toe
+, rock paper scissors, and various versions of an adventure game (Hero).
+
+## NFTs
+
+In the [NFTs](../../../sui_programmability/examples/nfts) example, browse non-fungible tokens of various types and see NFTs representing assets in a game.