feat: add w3n rouen slides (#44)

* feat: add w3n rouen slides

* chore: create README.md

presentations/2023-12-13--rouen--manfred/README.md

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+Preview: https://hackmd.io/@gno/SJZgEePIp
+Tweet: https://twitter.com/moul/status/1729503288767193322

presentations/2023-12-13--rouen--manfred/slides.md

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+# Gno: What, Why, and How
+
+Presented at Web3 Normandy
+Rouen, France
+December 13, 2023
+
+Speaker: Manfred Touron (@moul)
+
+---
+
+# Sorry, last-minute slides.
+
+---
+
+# What is Gno?
+
+- A new era in smart contracting, and open-source
+- Gno: Comprehensive smart contract suite: Gno.land (chain) + Gnolang (language).
+- Created by Cosmos co-founder Jae Kwon.
+
+----
+
+## Gno.land
+
+- The first L1 using Gnolang, a Go-based language for smart contracts.
+- Built on Tendermint2, Cosmos/IBC, secured by Proof of Contribution.
+- Prioritizes simplicity, security, and scalability.
+- Gnoweb: Integrated dApp server for contract interactions, no extra servers needed.
+
+----
+
+## Gnolang, a multi-user programming language
+
+- Go-based interpreted language for smart contracting. Powered by GnoVM.
+- Multi-user design enhances developer and app interaction. Mixing packages and apps.
+- Creates shared virtual environment, akin to developer MMORPG. Custom runtime cycle.
+- Contracts start standalone, then grow interconnected for better reusability.
+
+```
+                        ┌────────────────────────────┐
+                        │                            │
+                        │                            ▼
+    ┌───────┐       ┌───────┐       ┌───────┐    ┌───────┐
+    │   E   │──────▶│   C   │──────▶│   A   │    │   B   │
+    └───────┘       └───────┘       └───────┘    └───────┘
+        │                               ▲
+        │                               │
+        └───────────────────────────────┘
+```
+
+----
+
+## GnoVM + TM2, a virtual computer
+
+- mixing open-source, open-execution, open-state
+- 100% verifiable, auditable, no need to trust a third party
+- TM2: Computer
+- GnoVM: OS
+- Gnolang: API
+
+----
+
+## Gno's Galaxy of Blockchains
+
+- Cosmos ($ATOM) introduced interchain capabilities through:
+  - Energy-efficient BFT consensus mechanisms using PoS (Tendermint)
+  - Interconnected blockchains (IBC)
+  - SDK for developing appChains (Cosmos-SDK)
+- IBCx: Secure, typesafe, dynamic GnoVM chain interactions.
+- ICSx: Streamlines interchain licensing, validator models, scalability, and security.
+
+----
+
+## Under the (Gn)ood.
+
+
+```
++---------+   +----------+-------+----------------+
+|         |   |          |       |    Gnolang     |
+| Wallets |-->|          | GnoVM +----------------+
+|         |   |          |       |Execution State |
++---------+   |          +-------+-----+----------+
+              | Gno.land |             |   BFT    |
++---------+   |          | Tendermint2 +----------+
+|         |   |          |             |IBC + ICS |--interchain-->  ...
+|  Gnoweb |-->|          +-------------+----------+
+|         |   |          | Proof-of-Contribution  |
++---------+   +----------+------------------------+
+```
+
+----
+
+## Gno: Multi-User programming, deep contract interactions
+
+```go
+package foobar
+
+import (
+    "gno.land/r/foo20" // a grc20 token
+    "gno.land/r/users" // equivalent of ENS
+)
+
+func TransferToUsername(username string, amount int) {
+    user := users.Lookup(username)
+    foo20.Transfer(user.Addr(), amount)
+}
+```
+
+
+---
+
+# Why Gno?
+
+Web3/Decentralized: like Solidity.
++
+Transparent: like GitHub but not only for source.
++
+Powerful, Simple, Composable: like Go and Plan9.
+
+----
+
+# Blockchain is not (only) for DeFi
+
+----
+
+## Gno: Why Web3/Decentralized?
+
+- Trusting code over third parties,
+- Building a censorship-free knowledge base,
+- Creating flexible, trustworthy governance and democracies,
+- Supporting web3-dependent people in challenging environments.
+
+----
+
+## Gno: Why Transparent/Interpreted Contracts?
+
+- GitHub shows code but lacks execution proof.
+- Solidity details execution but lacks accessible source code.
+- Gno Contracts merge open-source code with execution.
+- Gno Contracts are callable apps and importable libraries.
+
+----
+
+## Gno: Why a New Language?
+
+- Simple, powerful, secure
+- Deterministic
+- Interpreted
+- Composable
+- Auto-Merkelized
+- ...
+
+---
+
+# How to Gno More?
+
+- GoR
+- Meet the team
+- Contribute
+- Learn to code