Add a new README

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README.md

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+# pyghmi
+
+Pyghmi is a pure Python (mostly IPMI) server management library.
+
+## Building and installing
+
+(These instructions have been tested on CentOS 7)
+
+Clone the repository, generate the RPM and install it:
+```bash
+$ git clone https://github.com/openstack/pyghmi.git
+$ cd pyghmi/
+$ python setup.py bdist_rpm
+$ sudo rpm -ivh dist/pyghmi-*.noarch.rpm
+```
+
+## Using
+
+There are a few use examples in the `bin` folder:
+
+- `fakebmc`: simply fakes a BMC that supports a few IPMI commands (useful for
+  testing)
+- `pyghmicons`: a remote console based on SOL redirection over IPMI
+- `pyghmiutil`: an IPMI client that supports a few direct uses of pyghmi (also
+  useful for testing and prototyping new features)
+- `virshbmc`: a BMC emulation wrapper using libvirt
+
+
+## Extending
+
+If you plan on adding support for new features, you'll most likely be interested
+in adding your methods to `pyghmi/ipmi/command.py`. See methods such as
+`get_users` and `set_power` for examples of how to use internal mechanisms to
+implement new features. And please, always document new methods.
+
+Sometimes you may want to implement OEM-specific code. For example, retrieving
+firmware version information is not a part of standard IPMI, but some servers
+are known to support it via custom OEM commands. If this is the case, follow
+these steps:
+- Add your generic retrieval function (stub) to the `OEMHandler` class in
+- `pyghmi/ipmi/oem/generic.py`. And please, document its intent, parameters and
+- expected return values.
+- Implement the specific methods that your server supports in subdirectories in
+- the `oem` folder (consider the `lenovo` submodule as an example). A OEM folder
+- will contain at least one class inheriting from `OEMHandler`, and optionally
+- helpers for running and parsing custom OEM commands.
+- Register mapping policies in `pyghmi/ipmi/oem/lookup.py` so pyghmi knows how
+- to associate a BMC session with the specific OEM code you implemented.
+
+A good way of testing the new feature is using `bin/pyghmiutil`. Just add an
+extension for the new feature you just implemented (as a new command) and call
+it from the command line:
+```
+$ IPMIPASSWORD=passw0rd bin/pyghmiutil [BMC IP address] username my_new_feature_command
+```