Add README and basic usage instructions

README.md

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+# Plogon
+
+A build tool for Dalamud plugins. It handles build and continuous integration tasks and is used for the [Dalamud plugin manifest](https://github.com/goatcorp/DalamudPluginsD17/) repository.
+
+## Usage
+
+Plogon can be run on both Windows and Linux systems, and needs .NET 6.0 and Docker installed to function.
+
+**Note:** If the Docker connection fails, make sure you're not using Podman as the C# Docker API doesn't seem to work with it yet.
+
+**Note:** If building fails with `/bin/bash: /static/entrypoint.sh: Permission denied` try disabling SELinux temporarily with `setenforce 0`.
+
+Plogon also requires a specific folder structure to work. Here's a preview of the folder structure we will create:
+
+```
+Plogon /
+   ...
+manifests /
+   PluginA /
+       manifest.toml
+   PluginB /
+       manifest.toml
+output /
+work /
+artifacts /
+```
+
+First, of course you need to clone Plogon itself:
+
+```
+git clone https://github.com/goatcorp/Plogon.git
+```
+
+Then we need a `manifests` folder which will house the plugin manifests. For each plugin, create a `manifest.toml` that describes the git repository to use among other information.
+
+```
+[plugin]
+repository = "<git repository>"
+commit = "<git hash>"
+owners = [ "<your name>" ]
+changelog = '''
+Your changelog in here.
+'''
+```
+
+You also need to place the plugin's icon into a subfolder named `icon.png`.
+
+You can see plenty of examples in the [Dalamud plugin manifest](https://github.com/goatcorp/DalamudPluginsD17/) repository. Next you need to create some empty folders:
+
+```
+mkdir output
+mkdir work
+mkdir artifacts
+```
+
+The `output` directory will be the Dalamud repository that's outputted (you can subsitute this for a pre-existing repository once you run Plogon once.) The `work` and `artifacts` are for temporary files and the compiled plugins respectively.
+
+Now it's time to run Plogon and start compiling our plugins:
+
+```
+cd Plogon/Plogon
+dotnet run -- \
+  --manifest-folder="../../manifests" \
+  --output-folder="../../output" \
+  --work-folder="../../work" \
+  --static-folder="static" \
+  --artifact-folder="../../artifacts" \
+  --build-overrides-file="../../manifests/overrides.toml" \
+  --mode=Development --build-all
+```
+(The build overrides file doesn't have to exist for now.)
+
+It may seem like a lot of options but most of the arguments are used to specify the paths to the many locations Plogon needs. Once it's complete, plugin are available under `artifacts` and the repsoitory should be under `output`.