Add documentation

README.md

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+Pixwhile is an alternative frontend to Pixiv that utilizes no Javascript.
+
+## Features
+
+- Does not contain an asinine amount of Javascript
+- Allows you to open the original versions of cover images and profile pictures
+- Can view illustrations and list user illustrations
+
+## Missing Features
+
+This list is not exhaustive, nor does it mean that these are being worked on.
+
+- No search
+- No ability to login
+- No ability to see comments or like counts

RUNNING.md

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+## Compiling
+
+- `mkdir build`
+- `cd build`
+- Execute one of the following commands depending on your conditions:
+  - If this is going to be on production (aka is not for debugging),
+    run `cmake -B . .. -DCMAKE_BUILD_TYPE=Release`
+  - If you are debugging Pixwhile, run `cmake -B . .. -DCMAKE_BUILD_TYPE=Debug`
+- `make -j$(nproc)`
+
+## Configuration
+
+Copy `example_config.json` to a file with any name you like
+(e.g. `config.json`), then open the copied file and edit the parameters to your
+liking (they should be self-explanatory, especially with comments).
+
+Pixwhile is intended to be run behind a reverse proxy (e.g. Nginx), so you
+should set your reverse proxy to proxy requests to
+`http://localhost:<port in config file>`, and set a `X-Canonical-Origin` header
+for all requests coming through to the URL for your instance. For example, if
+your instance is at https://pixwhile.example.com, you should set the header to
+`https://pixwhile.example.com`.
+
+## Running
+
+Run `./path/to/repository/build/pixwhile` with the path to your copied config
+file as an argument