Add Nim guide

Author: fryorcraken

docs/build/javascript/index.md

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-title: JavaScript Waku SDK
+title: JavaScript
 hide_table_of_contents: true
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docs/build/nim/index.md

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+---
+title: Nim
+hide_table_of_contents: true
+displayed_sidebar: build
+---
+
+Nwaku provides a native Nim implementation of the Waku protocol, allowing developers to build Waku native applications directly in Nim.
+This guide demonstrates how to use the Waku library API to create and configure Waku nodes.
+
+## Installation
+
+To use the Waku Nim SDK, you'll need to:
+
+1. Install [Nim](https://nim-lang.org/install.html) (version 2.2.4 or higher)
+2. Add the nwaku library to your project
+
+:::warning
+Waku does not currently work with Nimble package manager. You can track progress on Nimble support in [PR #3564](https://github.com/waku-org/nwaku/pull/3564).
+:::
+
+```bash
+# Install nwaku as a dependency
+nimble install waku
+```
+
+## Creating a Waku Node
+
+Waku uses blockchain smart contract to DoS protect nodes in the network.
+The protocol is called [RLN relay](/learn/concepts/protocols#rln-relay).
+
+To connect to the Waku Network, you'll need a Linea Sepolia RPC endpoint.
+
+Let's create a simple CLI that takes an RPC URL as argument:
+
+`your_waku_app.nim`
+```nim
+import std/options
+import chronos, results, confutils, confutils/defs
+import waku
+
+type CliArgs = object
+  ethRpcEndpoint* {.
+    defaultValue: "",
+    desc: "ETH RPC Endpoint for RLN support"
+  .}: string
+
+when isMainModule:
+  let args = CliArgs.load()
+
+  if args.ethRpcEndpoint == "":
+    echo "Please provide a Linea Sepolia RPC endpoint to connect to the Waku Network"
+    quit(QuitFailure)
+
+  echo "Starting Waku node with RLN..."
+
+  # Create configuration with RLN enabled
+  let config = NodeConfig.init(
+    ethRpcEndpoints = @[args.ethRpcEndpoint]
+  )
+
+  # Create the node
+  let node = (waitFor createNode(config)).valueOr:
+    echo "Failed to create node: ", error
+    quit(QuitFailure)
+
+  echo "Waku node created successfully!"
+
+  # Start the node
+  (waitFor startWaku(addr node)).isOkOr:
+    echo "Failed to start node: ", error
+    quit(QuitFailure)
+
+  echo "Node started successfully with RLN enabled!"
+  runForever()
+```
+
+### Running the CLI
+
+To run your CLI:
+
+```bash
+nim c -r your_waku_app.nim --ethRpcEndpoint="https://linea-sepolia.infura.io/v3/some-api-key"
+```
+
+## Blockchain-less Development Mode
+
+For development and testing purposes, you can create a Waku node without blockchain integration.
+This mode wil not have DoS protection but allows you to experiment with the Waku protocol without needing an RPC endpoint.
+
+`your_waku_app.nim`
+```nim
+import std/options
+import chronos, results
+import waku
+
+when isMainModule:
+  echo "Starting Waku node in development mode..."
+
+  # Create a basic configuration without RLN
+  let config = NodeConfig.init(
+    wakuConfig = WakuConfig.init(
+      entryNodes = @[],  # Add ENRs of bootstrap nodes if needed
+      clusterId = 42      # Use a custom cluster ID for your test network
+    )
+  )
+
+  # Create the node
+  let node = (waitFor createNode(config)).valueOr:
+    echo "Failed to create node: ", error
+    quit(QuitFailure)
+
+  echo "Waku node created successfully!"
+
+  # Start the node
+  (waitFor startWaku(addr node)).isOkOr:
+    echo "Failed to start node: ", error
+    quit(QuitFailure)
+
+  echo "Node started in development mode!"
+  runForever()
+```
+
+### Running in Development Mode
+
+```bash
+nim c -r your_waku_app.nimyour_waku_app.nim
+```
+
+## Configuration Options
+
+### With Custom Bootstrap Nodes
+
+You can specify bootstrap nodes to connect to specific networks:
+
+```nim
+let config = NodeConfig.init(
+  wakuConfig = WakuConfig.init(
+    entryNodes = @[
+      "enr:-P-4QG_d...",  # Replace with actual ENR
+      "/ip5/1.2..."       # Replace with actual multiaddr
+    ],
+    clusterId = 42
+  )
+)
+```
+
+## API Status
+
+:::info
+The Waku Nim library API is under active development. Currently, node creation and configuration are supported. Additional API verbs for message handling, subscriptions, and protocol interactions are work in progress.
+:::
+
+## Examples and Resources
+
+- [nwaku examples](https://github.com/waku-org/nwaku/tree/master/examples) - Official examples repository
+- [waku_api.nim](https://github.com/waku-org/nwaku/blob/master/examples/waku_api.nim) - Library API example
+- [nwaku repo](https://github.com/waku-org/nwaku) - nwaku GitHub Repository
+
+## Get Help
+
+- Visit the #help-desk channel on [Discord](https://discord.waku.org/)
+- Check the [nwaku GitHub repository](https://github.com/waku-org/nwaku) for issues and updates
+- Review the [protocol documentation](/learn/concepts/protocols) to understand Waku's capabilities

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