feat(chat): add `include` role to include files

Files may be included in the chat by a special `include` role. Each
file's contents will be added to an additional `user` role message with
the files separated by `==> {path} <==` where `{path}` is the path to
the file. Globbing is expanded out via `glob.glob` and relative apths to
the current working directory (as determined by `getcwd()`) will be
resolved to absolute paths.

Example:

```
>>> user

Generate documentation for the following files

>>> include

/home/user/myproject/src/../requirements.txt
/home/user/myproject/**/*.py

```

Fixes: #69

1 files changed, 16 insertions, 1 deletions

diff --git a/README.md b/README.md
index fa505dd..993e762 100644
--- a/README.md
+++ b/README.md
@@ -131,7 +131,22 @@ You are a Clean Code expert, I have the following code, please refactor it in a
 
 ```
 
-Supported chat roles are **`>>> system`**, **`>>> user`** and **`<<< assistant`**
+To include files in the chat a special `include` role is used:
+
+```
+>>> user
+
+Generate documentation for the following files
+
+>>> include
+
+/home/user/myproject/requirements.txt
+/home/user/myproject/**/*.py
+```
+
+Each file's contents will be added to an additional `user` role message with the files separated by `==> {path} <==`, where path is the path to the file. Globbing is expanded out via `glob.gob` and relative paths to the current working directory (as determined by `getcwd()`) will be resolved to absolute paths.
+
+Supported chat roles are **`>>> system`**, **`>>> user`**, **`>>> include`** and **`<<< assistant`**
 
 ### `:AINewChat`