Adding upstream version 0.3.1.

Signed-off-by: Daniel Baumann <daniel@debian.org>

README.md

@@ -0,0 +1,27 @@
+# logr
+Go logging library with levels.
+
+## Usage
+```console
+go get -u github.com/TwiN/logr
+```
+
+```go
+import "github.com/TwiN/logr"
+
+func main() {
+    logr.Debug("This is a debug message")
+    logr.Infof("This is an %s message", "info")
+    logr.Warn("This is a warn message")
+    logr.Error("This is an error message")
+    logr.Fatal("This is a fatal message") // Exits with code 1
+}
+```
+
+You can set the default logger's threshold like so:
+```go
+logr.SetThreshold(logr.LevelWarn)
+```
+The above would make it so only `WARN`, `ERROR` and `FATAL` messages are logged, while `DEBUG` and `INFO` messages are ignored.
+
+TODO: Finish documentation