Add SDK category

docs/SDKs/_category_.json

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+{
+  "position": 4,
+  "label": "SDKs"
+}

docs/SDKs/rust.mdx

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+---
+sidebar_position: 1
+title: Soroban Rust SDK
+---
+
+The `soroban_sdk` Rust crate contains the Soroban Rust SDK.
+
+:::caution
+The `soroban-sdk` is in early development. Report issues
+[here](https://github.com/stellar/soroban-sdk).
+:::
+
+## SDK Documentation
+
+SDK documentation is available at:
+https://docs.rs/crates/soroban-sdk
+
+## Subscribe to Releases
+
+Subscribe to releases on the GitHub repository:
+https://github.com/stellar/soroban-sdk
+
+## Add the `soroban_sdk` as a Dependency
+
+Add the following sections to the `Cargo.toml` to import the `soroban-sdk`.
+
+```toml
+[features]
+testutils = ["soroban-sdk/testutils"]
+
+[dependencies]
+soroban-sdk = { git = "https://github.com/stellar/rs-soroban-sdk", rev = "32b76650" }
+```

docs/examples/_category_.json

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 {
-  "position": 2,
+  "position": 3,
   "label": "Tutorials / Examples"
 }

docs/learn/_category_.json

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 {
-  "position": 3,
+  "position": 5,
   "label": "Learn"
 }

docs/under-the-hood/_category_.json

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 {
-  "position": 8,
+  "position": 6,
   "label": "Under the Hood"
 }