Added known issues to the newly created FAQ.md file

Signed-off-by: Lintong Jiang <lintongj@vmware.com>

FAQ.md

@@ -0,0 +1,22 @@
+# Frequently Asked Questions
+
+## v1.0.0
+1. The restore would fail if the K8s node VMs are placed in any sub-folders of vSphere VM inventory.
+    1. Workaround: moving node VMs to the top level of VM inventory. (for users of the release v1.0.0)
+    2. Solution: the issue was resolved post the release v1.0.0 in the master branch at commit 1c3dd7e20c3198e4a94a5a17874d4c474b48c2e2.
+2. The restore might possibly place the restored PVs in a vSphere datastore which is imcompatible with the StorageClass
+specified in the restored PVC, as we don't rely on the StorageClass for the PV placement on restore in the release v1.0.0.
+A fix to the PV placement based on the StorageClass can be expected in the next release.
+3. The plugin v1.0.0 is supposed to work well with Vanilla K8s cluster. We have not yet officially
+supported other type of K8s clusters, so there might be some expected issues.
+    1. In a TKG cluster, the secret of vSphere CSI credential, i.e., VC credential,
+    is named as `csi-vsphere-config` in the `kube-system` namespace, which might be problematic when using velero
+    with velero-plugin-for-vsphere v1.0.0 since it always tries to retrive the VC credential from the
+    serect `vsphere-config-secret` in the `kube-system` namespace. Hence, to use the plugin v1.0.0 in the TKG cluster,
+    the workaround is to add one another secret, `vsphere-config-secret`, with VC credential available in the secret
+    `csi-vsphere-config`. Below are a few of tips about the workaround based on the observation in
+    [Issue #63](https://github.com/vmware-tanzu/velero-plugin-for-vsphere/issues/63).
+        1. Make sure to use quotes to wrap around the value of each key-value pair in the `csi-vsphere.conf`
+        when constructing `vsphere-config-secret`.
+        2. Make sure to add one more key-value pair, `port = "443"`, under the `VirtualCenter` section.
+        As far as we know, the `port` key is absent from the `csi-vsphere.conf` of the secret `csi-vsphere-config` in TKG.