Lessons 1-5 recreated in Excel.

Excel/README.md

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+# This is the Excel documentation for NNFSiX
+
+## Goal
+The main goal of the project is: To use Excel to recreate the NNFSiX project, without using macros.
+
+## Requirements
+- min. Version Excel 2019 (unconfirmed). I am running on Office 365.
+
+## Guidelines
+Since there is no clear syntax for Excel. I tried to make it as user-friendly and coherent as possible.
+
+### First Column
+The first column is always for the variables. Mostly these do not serve a direct purpose, except to define the data
+beside it. However sometimes they are the keys to the objects i.e. sheets used. Thus, it is necessary to check that
+the variable, and it's respective object/sheet name is the same.
+
+### Objects
+
+Apart from the Ranges, each new defined Object will be saved as a sheet. Sheets like layer and activation contain
+predefined inputs and calculations. This allows for easier creation with copy pasting the sheets, subsequently 
+creating new objects and allowing for input parameters to dynamically be passed.
+
+#### Layers
+
+**Inputs:**
+1. layer_name: Text
+2. n_input: Number
+3. n_neurons: Number
+4. inputs: Range
+
+**Output:**
+1. output: Range (referenced by layer_name!output#)
+
+**To create a layer:**
+1. Define layer_name in the column A
+2. Define n_input in column B
+3. Define n_neurons in column C
+4. Reference your inputs as a range in column D
+5. Copy any layerX sheet and rename it to your layer_name
+
+**Example:**
+
+    | A      |  B        |  C          |  D                |
+    |--------|-----------|-------------|-------------------|
+	|        |  n_input  |	n_neurons  |  inputs           |
+	|--------|-----------|-------------|-------------------|
+    | layer2 |  4.0	     |  5.0        |  =layer1!output#  |
+
+#### Activation Functions
+
+**Inputs:**
+1. activation_name: Text
+2. inputs: Range
+
+**Output:**
+1. output: Range (referenced by activation_name!output#)
+
+**To create an activation function:**
+1. Define activation_name in the column A
+4. Reference your inputs as a range in column B
+5. Copy any activationX sheet and rename it to your activation_name
+
+**Example:**
+
+    | A           |  B                |
+    |-------------|-------------------|
+	|             |  inputs           |
+	|-------------|-------------------|
+    | activation1 |  =layer1!output#  |
+
+
+### Special Excel Stuff
+
+Anything out of the ordinary in Excel will be listed below.
+
+#### Ranges
+
+Careful when using Range References. Should you encounter a #SPILL error, if possible add adjacent empty rows or
+columns, as there might be a value blocking the output.
+
+**Output:**
+1. output: Range (referenced by cell_address#)
+
+**Example:**
+
+    ={1,2,3,2.5;2,5,-1,2;-1.5,2.7,3.3,-0.8}
+
+## Missing Stuff
+- Coloration of cells for readable input and output.