Added build instructions

README.md

@@ -169,6 +169,10 @@ Documentation can be found at [https://bci.js.org](https://bci.js.org) or by vie
 
 More examples can be found in the [examples](https://github.com/pwstegman/bcijs/tree/master/examples) directory
 
+## Building
+
+See [dev.md](dev.md) for info on how to modify and build bci.js
+
 ## Reference
 
 If you use bci.js in a published work, please reference this paper

dev.md

@@ -0,0 +1,40 @@
+## Building bci.js
+
+BCI.js methods are contained within the [lib](lib) directory. To keep the project organized, methods are separated into four folders:
+ - `compat` Deprecated methods which remain for compatibility purposes
+ - `data` Methods which pertain to data management (CSV files, partition data, etc.)
+ - `math` Methods used to process data (CSP, LDA, ICA, etc.)
+ - `network` Networking methods (OSC)
+
+If a method is Node.js exclusive and won't run in the browser, placing
+
+```html
+<p>This method is exclusive to Node.js</p>
+```
+
+below the method description in the documentation comment will exclude the method from the browser-only build.
+
+To create a new method, create a file in the appropriate folder, and make sure the file name matches the method name. When bci.js builds, it searches for new files within the [lib](lib) folders and adds them automatically.
+
+Looking at [index.js](index.js), you'll see each method of bci.js points to the appropriate file in [lib](lib). As such, making a change to an already existing method will not require rebuilding the index.js. However, adding a new method or renaming a method will require a rebuild.
+
+To rebuild [index.js](index.js), run
+
+```bash
+npm run build
+```
+
+This will also rebuild [browser.js](browser.js), which is index.js, but with the node-only methods removed. That way it can be used with webpack or browserify.
+
+To rebuild the [dist](dist) files for use in the browser, run
+
+```bash
+npm run dist
+```
+
+To rebuild the [docs](docs), run
+
+```bash
+npm run docs
+```
+