fix(read me): enhance cread me file and add coding guidelines (eclips…

…e-tractusx#916)

README.md

@@ -43,6 +43,82 @@ yarn start
 
 Note: if you'd like to run the complete frontend application, follow the `Run frontend on localhost.md` guide available within the technical documentation of [portal-assets](https://github.com/eclipse-tractusx/portal-assets).
 
+## Coding guidelines
+
+### Naming conventions for custom components
+
+Folder, File and component name to be in Camel Case\
+Scss files to be in Camel Case\
+RTK folders and files to be in small case
+
+### Import Components
+
+Always use components from [portal-shared-components library](https://github.com/eclipse-tractusx/portal-shared-components)\
+Do not import components directly from mui
+
+### Allowed imports from mui
+
+Box, useMediaQuery
+
+### Guidelines for consistent styling and theming
+
+Do not use useTheme from mui\
+Use theme from the [portal-shared-components library](https://github.com/eclipse-tractusx/portal-shared-components)\
+Use custom class names to override default or mui styles\
+Use appropriate `Typography` for the text and do not override font family of it
+
+### Create new text locale file
+
+Create a new file in the respective `language` folder with the module name in `assets/locales`\
+Use small cases for the `json` file\
+
+ex: notifications.json
+
+### Add new text values in locale file
+
+Keys inside `json` file should be in Camel Case\
+
+ex: notificationTitle
+
+### Read text values from locale file
+
+Import `useTranslation` from `react-i18next`\
+Declare translation object using the specific module\
+
+```
+const { t } = useTranslation('notification')
+```
+
+Empty in the usetransation() will pull the data from `main.json` file
+
+```
+const { t } = useTranslation()
+```
+
+Usage ex:
+
+```
+t('header.title')
+```
+
+### Code formatting and linting
+
+Before committing your changes,
+
+s1. Remove all the disabled linter rules from `.eslintrc.json` and run `yarn lint` on your newly created file or folder to see the results 2. Disable linter rules is allowd only for the exceptional cases. Code comments with proper reason is mandatory
+
+### Handling of API responses and error states
+
+1. All the api call has to be addressed with a throbber in the UI
+2. Empty response to be shown with a proper message to the user
+3. API error has to be shown in a component with appropriate action\
+   a. Error code 4xx needs to show error component with message\
+   b. Error code 5xx should allow user to refetch the api once again.
+
+### State Managment
+
+URL path names to be in Camel Case
+
 ## Known Issues and Limitations
 
 See [Known Knowns](/CHANGELOG.md#known-knowns).