Add initial README for discussion

README.md

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+# Logrus
+
+Logrus is a simple, opinionated logging package for Go. It has three debugging
+levels:
+
+* `LevelDebug`: Debugging, usually turned off for deploys.
+* `LevelInfo`: Info, useful for monitoring in production.
+* `LevelWarning`: Warnings that should definitely be noted. These are sent to
+  `airbrake`.
+* `LevelFatal`: Fatal messages that causes the application to crash. These are
+  sent to `airbrake`.
+
+## Usage
+
+The global logging level is set by: `logrus.Level = logrus.{LevelDebug,LevelWarning,LevelFatal}`.
+
+Note that for `airbrake` to work, `airbrake.Endpoint` and `airbrake.ApiKey`
+should be set.
+
+There is a global logger, which new loggers inherit their settings from when
+created (see example below), such as the place to redirect output. Logging can
+be done with the global logging module:
+
+```go
+logrus.Debug("Something debugworthy happened: %s", importantStuff")
+logrus.Info("Something infoworthy happened: %s", importantStuff")
+
+logrus.Warning("Something bad happened: %s", importantStuff")
+# Reports to Airbrake
+
+logrus.Fatal("Something fatal happened: %s", importantStuff")
+# Reports to Airbrake
+# Then exits
+```
+
+Types are encouraged to include their own logging object. This allows to set a
+context dependent prefix to know where a certain message is coming from, without
+cluttering every single message with this.
+
+```go
+type Walrus struct {
+  TuskSize uint64
+  Sex      bool
+  logger logrus.Logger
+}
+
+func NewWalrus(tuskSize uint64, sex bool) *Walrus {
+  return &Walrus{
+    TuskSize: tuskSize,
+    Sex: bool,
+    logger: logrus.NewLogger("Walrus"),
+  }
+}
+
+func (walrus *Walrus) Mate(partner *Walrus) error {
+  if walrus.Sex == partner.Sex {
+    return errors.New("Incompatible mating partner.")
+  }
+
+  walrus.logger.Info("Walrus with tusk sizes %d and %d are mating!", walrus.TuskSize, partner.TuskSize)
+  # Generates a logging message: <timestamp> [Info] [Walrus] Walrus with tusk sizes <int> and <int> are mating!
+
+  # Walrus mating happens here
+
+  return nil
+}
+```