Add listing and single nft contract examples (#68)

* First version of listing and single nft contract examples

* Update examples/cis1-single-nft/src/lib.rs

Co-authored-by: Aleš Bizjak <[email protected]>

* Update examples README with contracts listing-cis1 and cis1-single-nft

Co-authored-by: Aleš Bizjak <[email protected]>

Author: limemloh

concordium-cis1/src/lib.rs

@@ -50,7 +50,7 @@ pub type Sha256 = [u8; 32];
 /// The location of the metadata and an optional hash of the content.
 // Note: For the serialization to be derived according to the CIS1
 // specification, the order of the fields cannot be changed.
-#[derive(Debug, Serialize, SchemaType)]
+#[derive(Debug, Serialize, SchemaType, Clone)]
 pub struct MetadataUrl {
     /// The URL following the specification RFC1738.
     #[concordium(size_length = 2)]

examples/README.md

@@ -23,3 +23,6 @@ The list of contracts is as follows
   containing NFTs.
 - [cis1-wccd](./cis1-wccd) An example implementation of the CIS-1 Concordium Token Standard
   containing a single fungible token which is a wrapped CCD.
+- [cis1-single-nft](./cis1-single-nft) An example implementation of the CIS-1 Concordium Token Standard
+  specialized to contain a single non-fungible token per contract instance.
+- [listing-cis1](./listing-cis1) An example implementation of a contract for listing CIS-1 tokens. It is specialized only to work with the above NFT contract `cis1-single-nft`.

examples/cis1-single-nft/Cargo.toml

@@ -0,0 +1,21 @@
+[package]
+name = "cis1-single-nft"
+version = "0.1.0"
+authors = ["Concordium <[email protected]>"]
+edition = "2018"
+license = "MPL-2.0"
+
+[features]
+default = ["std"]
+std = ["concordium-std/std", "concordium-cis1/std"]
+
+[dependencies]
+concordium-std = {path = "../../concordium-std", default-features = false}
+concordium-cis1 = {path = "../../concordium-cis1", default-features = false}
+
+[lib]
+crate-type=["cdylib", "rlib"]
+
+[profile.release]
+codegen-units = 1
+opt-level = "s"