doc: Added Vale linter and NordicVale styles

.github/vale/README.md

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+# Vale Documentation Linting
+
+This directory contains configuration files for [Vale](https://vale.sh/docs), an open-source documentation linting tool.
+
+## Setup
+
+1. [Install Vale](https://vale.sh/docs/install):
+   - **Windows**: `choco install vale`
+   - **macOS**: `brew install vale`
+   - **Linux**: `snap install vale`
+
+2. Run the linting:
+   - **Windows**: `.\scripts\check-docs.ps1`
+   - **Linux/macOS**: `./scripts/check-docs.sh`
+
+## Configuration
+
+- `.vale.ini`: Main configuration file (located in the repository root)
+- `.github/vale/styles/`: Contains custom style rules
+- `.github/vale/vocab/`: Contains project-specific vocabulary
+
+## CI Integration
+
+Vale automatically runs on pull requests that modify documentation files via the GitHub Actions workflow defined in `.github/workflows/vale-lint.yml`.
+
+## Adding New Rules
+
+To add new style rules:
+
+1. Create a new YAML file in `.github/vale/styles/Vale/`.
+2. Define the rule using Vale's [style syntax](https://vale.sh/docs/styles).
+3. Test the rule locally.
+
+## Project-Specific Vocabulary
+
+Add project-specific terms to:
+- `.github/vale/vocab/Base/accept.txt` for words that should be accepted
+- `.github/vale/vocab/Base/reject.txt` for words that should be flagged

.github/vale/styles/Nordic/AMPM.yml_ignored

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+extends: existence
+message: Use 'AM' or 'PM' (preceded by a space).
+link: https://docs.microsoft.com/en-us/style-guide/a-z-word-list-term-collections/term-collections/date-time-terms
+level: error
+nonword: true
+tokens:
+  - '\d{1,2}[AP]M'
+  - '\d{1,2} ?[ap]m'
+  - '\d{1,2} ?[aApP]\.[mM]\.'

.github/vale/styles/Nordic/Accessibility.yml

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+extends: existence
+message: "Don't use language (such as '%s') that defines people by their disability."
+link: https://docs.microsoft.com/en-us/style-guide/a-z-word-list-term-collections/term-collections/accessibility-terms
+level: suggestion
+ignorecase: true
+tokens:
+  - a victim of
+  - able-bodied
+  - an epileptic
+  - birth defect
+  - crippled
+  - differently abled
+  - disabled
+  - dumb
+  - handicapped
+  - handicaps
+  - healthy person
+  - hearing-impaired
+  - lame
+  - maimed
+  - mentally handicapped
+  - missing a limb
+  - mute
+  - non-verbal
+  - normal person
+  - sight-impaired
+  - slow learner
+  - stricken with
+  - suffers from
+  - vision-impaired

.github/vale/styles/Nordic/Acronyms.yml

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+extends: conditional
+message: "'%s' has no definition."
+link: https://docs.microsoft.com/en-us/style-guide/acronyms
+level: suggestion
+ignorecase: false
+# Ensures that the existence of 'first' implies the existence of 'second'.
+first: '\b([A-Z]{3,5})\b'
+second: '(?:\b[A-Z][a-z]+ )+\(([A-Z]{3,5})\)'
+# ... with the exception of these:
+exceptions:
+  - ACME
+  - ADAC
+  - AES
+  - AMP
+  - API
+  - APIs
+  - APB
+  - ARM
+  - ASP
+  - BICR
+  - CBOR
+  - CCM
+  - CDDL
+  - CLI
+  - CLK
+  - COEX
+  - COM
+  - CPU
+  - CPUs
+  - CSN
+  - CSS
+  - CTRL
+  - CSV
+  - DEBUG
+  - DFU
+  - DK
+  - DMA
+  - DOM
+  - DPI
+  - DTS
+  - DVFS
+  - ESB
+  - EXMIF
+  - FAQ
+  - FLPR
+  - GCC
+  - GDB
+  - GET
+  - GND
+  - GPIO
+  - GPU
+  - GRTC
+  - GTK
+  - GUI
+  - HCI
+  - HEX
+  - HFXO
+  - HOST
+  - HTML
+  - HSFLL
+  - HSFLLs
+  - HTTP
+  - HTTPS
+  - ICMsg
+  - ICBMsg
+  - ID
+  - IDE
+  - IEEE
+  - IETF
+  - IPC
+  - IRQ
+  - ISR
+  - JAR
+  - JSON
+  - JSX
+  - LCS
+  - LESS
+  - LFCLK
+  - LFXO
+  - LLDB
+  - MAC
+  - MCU
+  - MIPI
+  - MPC
+  - MPI
+  - MRAM
+  - NCS
+  - NET
+  - NFC
+  - NOTE
+  - NSC
+  - NVDA
+  - NVM
+  - OEM
+  - OSS
+  - PATH
+  - PCA
+  - PCB
+  - PDF
+  - PHP
+  - POST
+  - PPR
+  - PRO
+  - PSA
+  - PUF
+  - RAM
+  - RAW
+  - REPL
+  - RESET
+  - RFC
+  - RISC
+  - RMA
+  - RoT
+  - ROM
+  - RSA
+  - RTOS
+  - SAADC
+  - SCFW
+  - SCM
+  - SCSS
+  - SDFW
+  - SDK
+  - SDRFW
+  - SDROM
+  - SMP
+  - SoC
+  - SPI
+  - SPIS
+  - SPU
+  - SQL
+  - SSF
+  - SSH
+  - SSL
+  - SUIT
+  - SVG
+  - SVD
+  - SWD
+  - SWJ
+  - SYSCTRL
+  - TCP
+  - TTP
+  - UART
+  - UARTE
+  - UARTE120
+  - UICR
+  - URI
+  - URIs
+  - URL
+  - USB
+  - USBHS
+  - UTF
+  - UUID
+  - VBUS
+  - VCOM
+  - VDD
+  - VDDH
+  - VEVIF
+  - VID
+  - VPR
+  - VPRs
+  - VSC
+  - XML
+  - XSS
+  - YAML
+  - ZIP