Add GNSS Flex module docs - ZED-X20P & IMU

Files to add a hookup guide for the SparkPNT GNSS Flex Module - ZED-X20P & IMU (optional)

Author: santaimpersonator

flex_boards/SparkPNT_GNSS_Flex_Module_ZED-X20P-Tilt/banner-repo.png

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+docs directory
+====================
+This folder should contain the files for the product documentation

flex_boards/SparkPNT_GNSS_Flex_Module_ZED-X20P-Tilt/docs/README.md

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+3d_model directory
+====================
+This folder should contain the 3D model of the product
+
+## Solder Mask - Color Correction Values
+Hex: #E0311D
+RGB: 224, 49, 29
+
+
+## File Optimizer
+https://glb.babylonpress.org/
+
+- Enable these options
+    - `Simplify | MeshoptSimplifier`
+    - `Quantize | KHR_mesh_quantization`
+    - `Use UASTC Zstandard Supercompression`
+- Set these options, to the following values:
+    - `ETC1S Quality Level (255 = best)`: 73
+    - `ETC1S Compression Level (0 = fastest)`: 5
+
+### VS Code Extension
+To reorder the materials for the rendering, use the [GlTF Tools extension](https://marketplace.visualstudio.com/items?itemName=cesium.gltf-vscode) in VS Code
+
+- https://marketplace.visualstudio.com/items?itemName=cesium.gltf-vscode
+- https://github.com/AnalyticalGraphicsInc/gltf-vscode
+
+
+## Model Editor
+https://modelviewer.dev/editor/
+
+
+
+## Old Methods
+
+### File Converter - `*.wrl` to `*.glb`
+https://imagetostl.com/convert/file/wrl/to/glb#convert
+
+### Solder Mask - Color Correction
+Open `*.glb` file and locate the `baseColorFactor` parameter with the following values:
+```
+          0.7027450799942017,
+          0.1537254899740219,
+          0.0909803956747055,
+          0.8313725590705872
+```
+Replace those values with the following values: `[,,,1]`
+```
+          0.7418950796127319,
+          0.0302486829459667,
+          0.0122311776503920,
+          1
+```
+
+### Solder Mask - Color Correction
+https://3deditoronline.com/
+
+### 1st File Optimizer *(Deprecated)*
+https://www.loci-labs.com/optimizer
+
+### 2nd File Optimizer *(Deprecated)*
+https://xiehangyun.github.io/gltf-optimization/
+
+- Max Texture Size: 512
+- Create Unified Palette Texture for Solid Colors and Merge: *(Unselect)*