refine doc; add more deploy instructions

deploy/centos.md

@@ -0,0 +1,29 @@
+# Deploy redroid on CentOS
+```
+## use custom 5.10 kernel
+
+### enable following kernel features
+
+# codec2 required, can use ION for legacy kernel
+CONFIG_DMABUF_HEAPS=y
+CONFIG_DMABUF_HEAPS_SYSTEM=y
+
+# optional, can use memfd
+CONFIG_STAGING=y
+CONFIG_ASHMEM=y
+
+# binderfs required
+CONFIG_ANDROID=y
+CONFIG_ANDROID_BINDER_IPC=y
+CONFIG_ANDROID_BINDERFS=y
+CONFIG_ANDROID_BINDER_DEVICES="binder,hwbinder,vndbinder"
+
+
+### running redroid
+docker run -itd --rm --privileged \
+    --pull always \
+    -v ~/data11:/data \
+    -p 5555:5555 \
+    --name redroid11 \
+    redroid/redroid:11.0.0-latest
+```