Update README and add aiohttp dependency

aiohttp has a weird issue when installing with pipenv. A workaround is
added in the README.md to at least cover that case when it comes time to
deploy on a real server.

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

README.md

@@ -5,11 +5,22 @@
 This is an IRC chatbot that can be extended with plugins. Omnibot comes with a
 few plugins pre-packaged.
 
-# Configuration
+# Configuring and running
 
 Copy the `config.example.toml` file to `config.toml` and fill it out for your needs.
 
 ## How do I add multiple servers?
 
 Simply put, you don't. Run another instance of the bot with its own
-configuration if you want to do that.
+configuration if you want to do that.
+
+## Running
+
+1. Install dependencies `pipenv install`
+2. Run `pipenv run python -m omnibot`
+
+# Troubleshooting
+
+## aiohttp fails to install
+
+`pipenv run pip install "aiohttp[speedups]"`