Added documentation page

Author: Itangalo

DOCUMENTATION.md

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+## How to use DiffusionBee
+
+This documentation is written for version 1.1.0. Parts of it may be unapplicable for other versions.
+
+### Installation
+
+On first launch, DiffusionBee will download and install additional data for image generation.
+
+## Generating images
+
+Depending on settings and available computing power it may take a few seconds to a few minutes to generate an image. Image generation may be aborted by pressing the stop button. Use the "save image" link to save the image to a location of your choice.
+
+Clicking on an image opens a separate window displaying the image in full size.
+
+### Text to image
+
+To create an image, simply enter a prompt and press _generate_.
+
+* The **Prompt ideas** button opens a web page where you can browse a gallery for finding useful prompts.
+* The **Styles** button provides a palette of often-used terms to add to the prompt.
+* The **Advanced options** buttons gives the following options:
+ * Num images: The number of images to generate.
+ * Image height/width: Sets the dimensions of the image. Note that Stable Diffusion is trained on 512 x 512 (the default setting). Other dimensions may give less good result and take more time.
+ * Steps: This corresponds to how many steps are used to improve the image quality. Setting to a low number gives faster image generation, and may be useful while exploring different prompts.
+ * Batch size: This tells DiffusionBee to generate multiple images at a time. New batches of images will be created until "num images" have been created. (Just increasing _num images_ is usually a better option.)
+ * Guidance scale: This kind of corresponds to how closely Stable Diffusion should stick to the prompt. Higher value means more strict interpretation.
+ * Seed: A number between 0 and 4,294,967,295 that is used as starting point for the image generation. If the same seed is used with the same prompt and the same settings (except *steps*, which may vary), the same image will be generated. If left empty, a random seed will be used.
+
+### Image to image
+
+Click on the left pane to upload a sketch starting image (only png supported). Add a prompt description of the desired output and press _generate_. The generated image will be 512 x 512 pixels.
+
+* The **Options** buttons gives the following options:
+ * Input strength: This tells DiffusionBee how closely to stick to the sketch input image. For rough sketches you normally want a low value.
+ * Num images: The number of images to generate.
+ * Steps: This corresponds to how many steps are used to build the image. Setting to a low number gives faster image generation, and may be useful while exploring different prompts.
+ * Seed: A number between 0 and 4,294,967,295 that is used as starting point for the image generation. If the same seed is used with the same image, the same prompt and the same settings (except *steps*, which may vary), the same image will be generated. If left empty, a random seed will be used.
+
+## History
+
+The **History** tab show previously generated images along with prompts and settings (including seed).
+
+## Extra tips
+
+* For prompt ideas and help, check out:
+ - [lexica.art](https://lexica.art/)
+ - [arthub.ai](https://arthub.ai/)
+ - `Prompt Engineering` section at [AssemblyAI](https://www.assemblyai.com/blog/how-to-run-stable-diffusion-locally-to-generate-images/)
+* Image generation requires a substantial amount of system memory. Close other applications for a faster generation.
+* You can save time while tuning your prompts by lowering the *steps* setting, then turning it back up once you found a good prompt.
+* When tuning prompts, make sure that you enter a seed to make it possible to recreate images. If you generate more than one image per seed (via either the Num Images or Batch setting) there will not be a way to tie any of the images generated after the first one to the same seed. For example, if I have Num Images set to 3 and Seed set to 1000, the first of my three generated images will correspond to the seed of 1000, but I won't know the seed for the other two images.
+* When _num images_ is set to more than 1, `1234` is added to the seed for each image following the first one. (This can be used to recreate number 4 in a string of images without having to recreate all the previous ones.)
+* All created images are stored at `~/.diffusionbee/images/` in your file system. There is no interface in DiffusionBee for deleting images, but they can be deleted manually from this hidden directory.
+* The model is stored at `~/.diffusionbee/downloads`. If you already have the model available and don't want to re-download it, move, copy or symlink it to that directory.
+* The _Show logs_ menu option shows logs that are mostly useful for developers or for tracking errors. You exit the log by clicking one of the tabs.
+
+## Join the discussion
+
+Join the DiffusionBee discord at https://discord.gg/t6rC5RaJQn