feat: add nvim feature (#104)

Author: BusHero

features/src/neovim/README.md

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+# texlive
+
+# 
+
+```json
+"features": {
+    ghcr.io/bushero/devcontainers/features/texlive:3.1.0: {}
+}
+```
+
+## Options
+
+| Options Id | Description | Type | Default Value |
+|-----|-----|-----|-----|
+| scheme | TeX packages to be installed | String | scheme-basic |
+| packages | TeX packages to be installed | String |  |
+
+## Customizations
+
+### VS Code Extenssions
+
+- `james-yu.latex-workshop`
+
+---
+
+_Note: This file was auto-generated from the [devcontainer-feature.json](/features/src/texlive/devcontainer-feature.json). Add additional notes to a `Notes.md`._

features/src/neovim/devcontainer-feature.json

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+{
+	"$schema": "https://raw.githubusercontent.com/devcontainers/spec/main/schemas/devContainerFeature.schema.json",
+	"id": "neovim",
+	"version": "1.0.0",
+	"name": "Neovim"
+}

features/src/neovim/install.sh

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+#!/bin/sh
+
+
+apk update
+apk upgrade
+apk add neovim

features/test/neovim/alpine.sh

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+#!/bin/sh
+set -e
+
+nvim --version

features/test/neovim/scenarios.json

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+{
+	"alpine": {
+		"image": "alpine:latest",
+		"features": {
+			"neovim": {}
+		}
+	}
+}