Add a description for input plugin creation

Signed-off-by: Hiroshi Hatake <[email protected]>

Author: cosmo0920

README.md

@@ -1,17 +1,21 @@
 # Fluent Bit Go!
 
-This repository contains Go packages that allows to create [Fluent Bit][fluent-bit] plugins. At the moment it only supports the creation of _Output_ plugins.
+This repository contains Go packages that allows to create [Fluent Bit][fluent-bit] plugins. At the moment it only supports the creation of _Output_ and _Input_ plugins.
 
 ## Requirements
 
-The code of this package is intended to be used with [Fluent Bit v1.4][fluent-bit-1-4] branch or higher.
+The code of this package for output plugin is intended to be used with [Fluent Bit v1.4][fluent-bit-1-4] branch or higher.
+
+The code of this package for input plugin is intended to be used with [Fluent Bit v1.9][fluent-bit-1-9] branch or higher.
 
 ## Usage
 
 Fluent Bit Go packages are exposed on this repository:
 
 [github.com/fluent/fluent-bit-go][fluent-bit-go]
 
+### Creating Output Plugin
+
 When creating a Fluent Bit Output plugin, the _output_ package can be used as follows:
 
 ```go
@@ -20,6 +24,14 @@ import "github.com/fluent/fluent-bit-go/output"
 
 For a more practical example please refer to the [out\_multiinstance plugin][multiinstance] implementation located at:
 
+### Creating Input Plugin
+
+When creating a Fluent Bit Input plugin, the _input_ package can be used as follows:
+
+```go
+import "github.com/fluent/fluent-bit-go/input"
+```
+
 ## Contact
 
 Feel free to join us on our Slack channel, Mailing List, IRC or Twitter:
@@ -36,6 +48,7 @@ other [contributors][contributors].
 
 [fluent-bit]: http://fluentbit.io/
 [fluent-bit-1-4]: https://github.com/fluent/fluent-bit/tree/v1.4.0
+[fluent-bit-1-9]: https://github.com/fluent/fluent-bit/tree/1.9
 [multiinstance]: https://github.com/fluent/fluent-bit-go/tree/fc386d263885e50387dd0081a77adf4072e8e4b6/examples/out_multiinstance
 [fluent-bit-go]: http://github.com/fluent/fluent-bit-go
 [treasure-data]: http://treasuredata.com