Add README.md

Author: risou

README.md

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+# Alfred Workflow for Qiita:Team
+
+## Usage
+
+### Setup variables
+
+At first, you need to set 2 variables to workflow.
+
+| key | value |
+| :--: | :--- |
+| team | your team_id in Qiita:Team |
+| token | your access token of Qiita (need `read_qiita_team`) |
+
+### Use command
+
+Type `qt` and keywords you want to search.