improve documentation

Dockerfile

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-FROM node:latest
+FROM node:14-alpine
 
 WORKDIR /bot
 

LICENSE

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+
+The MIT License (MIT)
+
+Copyright (c) 2020 Sergey Sova
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

README.md

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+# Gist-Write v1
+
+The action to write content to a gist from an input.
+
+See also [gist-read](https://github.com/sergeysova/gist-read-action).
+
+## Usage
+
+See [action.yml](./action.yml)
+
+## Examples
+
+Simple (just write content from input to a file to a gist):
+
+```yaml
+steps:
+  - uses: sergeysova/gist-write-action@v1
+    with:
+      gist_id: 7bcddb642d16d291959642fc60feec9b
+      file_name: example.txt
+      content: "100"
+```
+
+Increment counter (read value from a gist, increment it, write to the gist):
+
+```yaml
+steps:
+  - uses: sergeysova/gist-read-action@v1
+    id: counter
+    with:
+      gist_id: 7bcddb642d16d291959642fc60feec9b
+      file_name: example.txt
+
+  - name: Increment
+    id: increment
+    run: |
+      export COUNTER=${{steps.counter.outputs.content}}
+      echo "::set-output name=value::$((COUNTER + 1))"
+
+  - uses: sergeysova/gist-write-action@v1
+    with:
+      gist_id: 7bcddb642d16d291959642fc60feec9b
+      file_name: example.txt
+      content: ${{steps.increment.outputs.value}}
+```
+
+## License
+
+The scripts and documentation in this project are released under the [MIT License](./LICENSE)

action.yml

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-name: "sergeysova-gist-write"
-description: "Action to write data to gist"
+name: "Gist Write Action"
+author: Sergey Sova
+description: "The action to write content to a gist"
 inputs:
   gist_id:
     description: "Gist ID"
     required: true
   file_name:
-    description: "File name at the gist to write data at"
+    description: "Name of the file at the gist to write data at"
     required: true
   content:
     description: "Content to write"
@@ -16,3 +17,6 @@ outputs:
 runs:
   using: "docker"
   image: "Dockerfile"
+branding:
+  color: blue
+  icon: upload-cloud