docs(en): development page

docs/community/development.md

@@ -1 +1,184 @@
 # Development
+
+## Adding services
+
+Let's analyze the creation of a new `Bitcoin` service, which will receive information from an external API.
+
+#### 1. Create interface
+
+The first step is to designate the service interaction interface. It is necessary to define additional properties:
+
+::: code-group
+```typescript [types/services.d.ts]
+export interface BitcoinService extends BaseService {
+  options?: {
+    code: string
+    interval?: number
+  }
+}
+```
+:::
+
+#### 2. Create component
+
+::: code-group
+```vue [components/service/bitcoin.vue]
+<template>
+  <ServiceBase v-bind="props">
+    <template #title>
+      {{ $('service.bitcoin.title', { code: options.code }) }}
+    </template>
+    <template #description>
+      {{ $('service.bitcoin.description', { rate: data?.rate || '0' }) }}
+    </template>
+  </ServiceBase>
+</template>
+
+<script setup lang="ts">
+import type { BitcoinService } from '~/types'
+
+const props = defineProps<BitcoinService>()
+const { data, pauseUpdate } = useServiceData<BitcoinService, { rate: string }>(props, {
+  updateInterval: props?.options?.interval
+})
+
+onBeforeUnmount(pauseUpdate)
+</script>
+```
+:::
+
+#### 3. Writing translations
+
+If static text is used in the component, it should be placed in a translation file.
+It is required to add `en-US.json` translations, the rest are optional.
+
+::: code-group
+```json [locales/ru-RU.json]
+{
+  "service": {
+    "bitcoin": { // [!code focus]
+      "title": "Code {code}", // [!code focus]
+      "description": "Rate {rate}" // [!code focus]
+    } // [!code focus]
+  }
+}
+```
+:::
+
+Translations are based on [vue-i18n](https://vue-i18n.intlify.dev/). Absolutely all features are available.
+
+#### 4. Data retrieval
+
+::: code-group
+```typescript [server/api/services/bitcoin.ts]
+import type { BitcoinService } from '~/types'
+
+export default defineEventHandler(async (event): Promise<{ rate: string }> => {
+  const service = await getService<BitcoinService>(event)
+
+  try {
+    const data = await $fetch('https://api.coindesk.com/v1/bpi/currentprice.json', {
+      parseResponse: (text) => JSON.parse(text)
+    })
+
+    return {
+      rate: data.bpi[service.option.code].rate
+    }
+  } catch (e) {
+    logger.error(e)
+  }
+
+  return {
+    rate: '-'
+  }
+})
+```
+:::
+
+#### 5. Updating documentation
+
+Don't forget to add the service to the documentation so that other users are aware and can use it.
+
+To do this, create files:
+
+* `docs/services/bitcoin.md`
+* `docs/{lang}/services/bitcoin.md` - can be left empty
+
+## Creating theme
+
+#### 1. Adding CSS variables
+
+::: code-group
+```css [assets/style/tailwind.css]
+html.new-theme {
+    --fg: 67 52 34;
+    --fg-dimmed: 80 66 49;
+    --background: 241 231 208;
+}
+```
+:::
+
+#### 2. Adding to Config
+
+::: code-group
+```typescript [types/config.d.ts]
+export interface Config {
+    title?: string
+    lang: 'en' | 'ru'
+    theme?: 'system' | 'light' | 'dark' | 'deep' | 'new-theme' // [!code focus]
+    services: ServicesGroup[]
+    checkUpdates: boolean
+}
+```
+:::
+
+#### 3. Updating documentation
+
+Don't forget to add `new-theme` to the documentation so that other users are aware of your theme.
+
+To do this, find the theme section in all translations and add the new-theme parameter:
+
+* `docs/reference/configuration.md`
+* `docs/{lang}/reference/configuration.md`
+
+## Writing translations
+
+#### 1. Creating a new language file
+
+Create a new file in the `locales` folder. We recommend to copy `locales/en-US.json` and make translation based on it.
+
+#### 2. File connection
+
+After creating the language file, you need to plug it into `nuxt.config.ts`
+
+```typescript
+export default defineNuxtConfig({
+    i18n: {
+        locales: [
+            {                           // [!code focus]
+                code: 'en',             // [!code focus]
+                iso: 'en-US',           // [!code focus]
+                name: 'English',        // [!code focus]
+                file: 'en-US.json',     // [!code focus]
+            },                          // [!code focus]
+        ],
+    },
+})
+```
+
+#### 3. Updating documentation
+
+Don't forget to add the new language to the documentation so that other users are aware of the translation.
+
+To do this, find the language section in all translations and add a new parameter:
+
+* `docs/reference/configuration.md`
+* `docs/{lang}/reference/configuration.md`
+
+## Updating dependencies
+
+This is not necessary. The project has [Dependabot](https://github.com/dependabot), which scans for new dependencies once a week.
+But if you still have such a need, run the `yarn upgrade` command. After that, check everything that
+has been updated.
+
+Once you are sure that the application works, create a new `pull request`.