Add GCS to supported filesystems

docs/gcs_filesystem.md

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+---
+title: GCS Filesystem (experimental)
+keywords: sql hive gcs spark presto
+sidebar: mydoc_sidebar
+permalink: gcs_hoodie.html
+toc: false
+summary: In this page, we go over how to configure hoodie with Google Cloud Storage.
+---
+Hoodie works with HDFS by default and GCS **regional** buckets provide an HDFS API with strong consistency.
+
+## GCS Configs
+
+There are two configurations required for Hoodie GCS compatibility:
+
+- Adding GCS Credentials for Hoodie
+- Adding required jars to classpath
+
+### GCS Credentials
+
+Add the required configs in your core-site.xml from where Hoodie can fetch them. Replace the `fs.defaultFS` with your GCS bucket name and Hoodie should be able to read/write from the bucket.
+
+```xml
+  <property>
+    <name>fs.defaultFS</name>
+    <value>gs://hoodie-bucket</value>
+  </property>
+
+  <property>
+    <name>fs.gs.impl</name>
+    <value>com.google.cloud.hadoop.fs.gcs.GoogleHadoopFileSystem</value>
+    <description>The FileSystem for gs: (GCS) uris.</description>
+  </property>
+
+  <property>
+    <name>fs.AbstractFileSystem.gs.impl</name>
+    <value>com.google.cloud.hadoop.fs.gcs.GoogleHadoopFS</value>
+    <description>The AbstractFileSystem for gs: (GCS) uris.</description>
+  </property>
+
+  <property>
+    <name>fs.gs.project.id</name>
+    <value>GCS_PROJECT_ID</value>
+  </property>
+  <property>
+    <name>google.cloud.auth.service.account.enable</name>
+    <value>true</value>
+  </property>
+  <property>
+    <name>google.cloud.auth.service.account.email</name>
+    <value>GCS_SERVICE_ACCOUNT_EMAIL</value>
+  </property>
+  <property>
+    <name>google.cloud.auth.service.account.keyfile</name>
+    <value>GCS_SERVICE_ACCOUNT_KEYFILE</value>
+  </property>
+```
+
+### GCS Libs
+
+GCS hadoop libraries to add to our classpath
+
+- com.google.cloud.bigdataoss:gcs-connector:1.6.0-hadoop2