neuralnetlib 2.0.0

• docs: add new examples and better folder sorting
• Merge pull request #18 from marcpinet/docs-better-code-examples
• refactor: tkinter now uses real time refresh
• Merge pull request #19 from marcpinet/refactor-realtime-update-tkinter
• docs: update readme
• Merge pull request #20 from marcpinet/fix-readme
• feat: add progress bar, val_accuracy and time metrics
• feat: add Conv2D, MaxPooling2D, Flatten layers
• feat: add cnn example
• refactor: reformat and optimize code to standards
• feat: remove the need of input_shape in hidden layers + auto detection
• test(fix): update tests to match correct paramters
• feat: add str methods
• refactor: simplified example for faster runtime
• feat: update maxpooling autoguess for pool size and strides
• docs: update side note
• fix: from_config for layers
• docs: update README and resources
• docs: update gif
• refactor: changed shape for cnn impl and add comment for simple nn
• docs: update readme details
• ci: bump version to 2.0.0
• Merge pull request #21 from marcpinet/feat-cnn-layers