Add: cw721-non-transferable-with-metadata-onchain

contracts/cw721-non-transferable-with-metadata-onchain/.cargo/config

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+[alias]
+wasm = "build --release --target wasm32-unknown-unknown"
+wasm-debug = "build --target wasm32-unknown-unknown"
+unit-test = "test --lib"
+schema = "run --example schema"

contracts/cw721-non-transferable-with-metadata-onchain/Cargo.toml

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+[package]
+name = "cw721-non-transferable-with-metadata-onchain"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+[lib]
+crate-type = ["cdylib", "rlib"]
+
+
+[features]
+# for more explicit tests, cargo test --features=backtraces
+backtraces = ["cosmwasm-std/backtraces"]
+# use library feature to disable all instantiate/execute/query exports
+library = []
+
+[dependencies]
+cosmwasm-schema = { workspace = true }
+cosmwasm-std    = { workspace = true }
+cw-storage-plus = { workspace = true }
+cw2             = { workspace = true }
+cw721           = { workspace = true }
+cw721-base      = { workspace = true, features = ["library"] }
+schemars        = { workspace = true }
+serde           = { workspace = true }
+thiserror       = { workspace = true }
+cw-utils        = { workspace = true }
+cw-ownable      = { workspace = true }

contracts/cw721-non-transferable-with-metadata-onchain/README.md

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+# CosmWasm Non-Transferable NFT with Onchain Metadata
+A Non-Transferable NFT implementation by extending [`cw721-base`](https://github.com/CosmWasm/cw-nfts/tree/main/contracts/cw721-base) and using [`cw_ownable`](https://github.com/larry0x/cw-plus-plus/tree/main/packages/ownable) functions:
+
+```rust
+initialize_owner(deps.storage, deps.api, msg.admin.as_deref())?;
+```
+
+and 
+
+```rust
+get_ownership(deps.storage)?.owner;
+```
+to check only contract owner can execute with the additional feature of onchain metadata:
+
+```rust
+#[derive(Serialize, Deserialize, Clone, PartialEq, JsonSchema, Debug)]
+pub struct Trait {
+    pub display_type: Option<String>,
+    pub trait_type: String,
+    pub value: String,
+}
+
+#[derive(Serialize, Deserialize, Clone, PartialEq, JsonSchema, Debug)]
+pub struct Metadata {
+    pub image: Option<String>,
+    pub image_data: Option<String>,
+    pub external_url: Option<String>,
+    pub description: Option<String>,
+    pub name: Option<String>,
+    pub attributes: Option<Vec<Trait>>,
+    pub background_color: Option<String>,
+    pub animation_url: Option<String>,
+    pub youtube_url: Option<String>,
+}
+
+pub type Extension = Option<Metadata>;
+```
+
+This simplifies the json schema as it can be written now:
+
+```rust
+use cosmwasm_schema::write_api;
+
+use nft::{ExecuteMsg, InstantiateMsg, QueryMsg};
+
+fn main() {
+    write_api! {
+        instantiate: InstantiateMsg,
+        execute: ExecuteMsg,
+        query: QueryMsg,
+    }
+}
+```
+which was more complex in the [`cw721-non-transferable`](https://github.com/CosmWasm/cw-nfts/tree/main/contracts/cw721-non-transferable).

contracts/cw721-non-transferable-with-metadata-onchain/examples/schema.rs

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+use cosmwasm_schema::write_api;
+
+use cw721_non_transferable_with_metadata_onchain::{ExecuteMsg, InstantiateMsg, QueryMsg};
+
+fn main() {
+    write_api! {
+        instantiate: InstantiateMsg,
+        execute: ExecuteMsg,
+        query: QueryMsg,
+    }
+}