feat: initial implementation

Credits goes to OpenAI o1-preview + Cursor with Claude 3.5 Sonet

`o1-preview` generated bunch of syntax that doesn't exist.
I had to only use cursor.dev pretrained on Gleam to fix syntax errors and provide docs for stdlib on further iterations.

You can find creation session at https://chatgpt.com/share/66f5db20-c7fc-8004-b7d6-db55d720f6c8

.github/workflows/test.yml

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+name: test
+
+on:
+  push:
+    branches:
+      - master
+      - main
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: erlef/setup-beam@v1
+        with:
+          otp-version: "27.0.1"
+          gleam-version: "1.5.1"
+          rebar3-version: "3"
+          # elixir-version: "1.15.4"
+      - run: gleam deps download
+      - run: gleam test
+      - run: gleam format --check src test

.gitignore

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+*.beam
+*.ez
+/build
+erl_crash.dump

README.md

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+# gleojson
+
+[![Package Version](https://img.shields.io/hexpm/v/gleojson)](https://hex.pm/packages/gleojson)
+[![Hex Docs](https://img.shields.io/badge/hex-docs-ffaff3)](https://hexdocs.pm/gleojson/)
+
+**gleojson** is a GeoJSON parsing and encoding library for Gleam, following the [RFC 7946](https://tools.ietf.org/html/rfc7946) specification. It provides types and utility functions to encode and decode GeoJSON objects such as Points, LineStrings, Polygons, and more.
+
+## Installation
+
+Add **gleojson** to your Gleam project:
+
+```sh
+gleam add gleojson
+```
+
+## Usage
+
+```gleam
+pub fn main() {
+  let json_string = "{
+    \"type\": \"Feature\",
+    \"geometry\": {
+    \"type\": \"Point\",
+    \"coordinates\": [125.6, 10.1]
+    },
+    \"properties\": {
+    \"name\": \"Dinagat Islands\"
+    }
+  }"
+  // Decode the JSON string into a GeoJSON object
+  let result = json.decode(from: json_string, using: gleojson.geojson_decoder)
+  case result {
+    Ok(geojson) -> {
+      // Successfully decoded GeoJSON
+      let encoded = gleojson.encode_geojson(geojson)
+      // encoded is now a Dynamic representation of the GeoJSON object
+      // You can use it for further processing or encoding back to JSON
+    }
+    Error(errors) -> {
+      todo
+      // Handle decoding errors
+      // errors contains information about what went wrong during decoding
+    }
+  }
+}
+```
+
+Further documentation can be found at https://hexdocs.pm/gleojson.
+
+## Development
+
+```
+gleam build
+gleam test
+```

gleam.toml

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+name = "gleojson"
+version = "0.1.0"
+
+description = "A Gleam library for encoding and decoding GeoJSON"
+licences = ["MIT"]
+repository = { type = "github", user = "guria", repo = "gleojson" }
+links = [{ title = "RFC7946", href = "https://datatracker.ietf.org/doc/html/rfc7946" }]
+
+[dependencies]
+gleam_stdlib = ">= 0.34.0 and < 2.0.0"
+gleam_json = ">= 2.0.0 and < 3.0.0"
+
+[dev-dependencies]
+gleeunit = ">= 1.0.0 and < 2.0.0"

manifest.toml

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+# This file was generated by Gleam
+# You typically do not need to edit this file
+
+packages = [
+  { name = "gleam_json", version = "2.0.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleam_json", source = "hex", outer_checksum = "CB10B0E7BF44282FB25162F1A24C1A025F6B93E777CCF238C4017E4EEF2CDE97" },
+  { name = "gleam_stdlib", version = "0.40.0", build_tools = ["gleam"], requirements = [], otp_app = "gleam_stdlib", source = "hex", outer_checksum = "86606B75A600BBD05E539EB59FABC6E307EEEA7B1E5865AFB6D980A93BCB2181" },
+  { name = "gleeunit", version = "1.2.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleeunit", source = "hex", outer_checksum = "F7A7228925D3EE7D0813C922E062BFD6D7E9310F0BEE585D3A42F3307E3CFD13" },
+]
+
+[requirements]
+gleam_json = { version = ">= 2.0.0 and < 3.0.0" }
+gleam_stdlib = { version = ">= 0.34.0 and < 2.0.0" }
+gleeunit = { version = ">= 1.0.0 and < 2.0.0" }