Diff: mbed-os/tools/importer/README.md

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+## Importing repositories into mbed-os
+
+importer.py script can be used to import code base from different repositories into mbed-os.
+
+### Pre-requisties
+1. Get the required repository clone and update it to commit required. Note: Repository should be placed outside the mbed-os.
+2. Create json file as per template
+
+### JSON file template
+
+You can list all the files and folders which are required to be copied in config file in `file` and `folder` arrays respectively. Script will remove the files/folders specified in `src` section from mbed-os repository before copy operation is performed.
+New commit is created on branch `feature_+repo_name+last_sha` with commit message "[REPO_NAME]: Updated to last_sha"
+
+Note: Only files present in folder will be copied, directories inside the folder will not be copied.
+
+`commit_sha` is list of commits present in mbed-os repo. These commits will be applied after copying files and folders listed above.Each commit in the commit_sha list is cherry-picked and applied with the -x option, which records the SHA of the source commit in the commit message.
+Note: You must resolve any conflicts that arise during this cherry-pick process. Make sure that the "(cherry picked from commit ...)" statement is present in the commit message. Re-execute the python script to apply rest of the SHA commits.
+
+{
+  "files" : [
+    {
+      "src_file" : "CMSIS/Core/Template/ARMv8-M/tz_context.c",
+      "dest_file" : "cmsis/TARGET_CORTEX_M/mbed_tz_context.c"
+    },
+    ...
+    {
+      "src_file" : "",
+      "dest_file" : ""
+    }
+  ],
+  "folders" : [
+    {
+      "src_folder" : "CMSIS/Core/Include/",
+      "dest_folder" : "cmsis/TARGET_CORTEX_M/"
+    },
+    ...
+    {
+      "src_folder" : "",
+      "dest_folder" : ""
+    }
+  ],
+   "commit_sha" : [
+      "428acae1b2ac15c3ad523e8d40755a9301220822",
+      "d9d622afe0ca8c7ab9d24c17f9fe59b54dcc61c9",
+    ]
+}
+
+### Input to importer.py
+1. Repository: -r <repo_path> ( Example: CMSIS / Mbed-tls / uVisor)
+2. `repo`_importer.json: -c <json_file>  (Example: cmsis_importer.json)