add my opencre user guide (#558)

docs/my-opencre-user-guide.md

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+# MyOpenCRE API
+
+## Introduction
+
+This user guide briefly describes how to use the REST API of the MyOpenCRE functionality.
+MyOpenCRE allows OpenCRE users to modify the OpenCRE catalogue by importing their own standards and updating the resources.
+It is ONLY usable by running OpenCRE locally.
+
+You can do so by running the docker container with a local database like so:
+```bash
+mkdir creDB
+docker run -ti -v `pwd`/creDB:/db:rw \
+     -e CRE_ALLOW_IMPORT=1 \
+     -e PROD_DATABASE_URL="sqlite:///db/db.sqlite" \
+     -p 5000:5000 \
+     ghcr.io/owasp/opencre/opencre:latest
+```
+
+Please note that the first time you run this it will take a while as it needs to mirror the remote CRE database.
+Once the screen has stopped producing text, you can find CRE in `localhost:5000`
+
+## Endpoints
+
+MyOpenCRE consists of two endpoints. `Generate CSV template` and `Import`
+The `Generate` endpoint is a GET request that downloads a CSV containing all the CREs that your local CRE instance knows about.
+The `Import` endpoint is a POST request that allows you to import the above CSV containing extra information or changes.
+
+### Generate CRE CSV
+
+You can download this CSV from the CRE instance with the command:
+```bash
+    curl localhost:5000/rest/v1/cre_csv
+```
+This allows you to manipulate the CRE graph using any spreadsheet software you want.
+
+### Import From CRE CSV
+
+Once you have made appropriate modifications, you can re-import with:
+
+```bash
+curl -X POST http://localhost:5000/rest/v1/cre_csv_import -F "[email protected]"
+```
+
+### CRE CSV Format
+
+You can find an example of the CRE CSV below.
+There a couple things you need to pay attention for.
+
+#### Staggered CREs
+
+In the example below, CRE: `111-111` being in the column CRE0 means it's a `root` CRE (has no parent).
+Conversely CRE: `222-222` being in the column CRE1 means it's a child of `111-111` similarly for `333-333` being a child of `222-222`
+If you wanted to add `444-444` which is a child of `111-111` you could add a line with `444-444` being in the column `CRE 1`
+
+The current CRE hierarchy has 5 levels so expect CREs up to `CRE 5`
+
+### Separators
+
+While this is a CSV file, you might have noticed that several elements contain a vertical break `|` character.
+This allows the authors of the csv to instruct the OpenCRE application what is each field.
+For CRES, the format is: `cre-id|"Name of the CRE"` so in the example below, `111-111` has a name of `Hello`
+For standards the format is only used in the header to denote what is each column.
+So for the standard named: "My Policy", column 4 is the name of each section, column 5 is the id of each section/clause and column 6 is the hyperlink to that particular clause.
+
+```csv
+CRE 0,CRE 1,CRE 2,My Policy|name,My Policy|id,My Policy|hyperlink
+111-111|Hello,,,"this is my policy section blah, linked to cre 111-111",1.1,https://example.com/1
+,222-222|World,,"this is my policy section blah, linked to cre 222-222",2.2,https://example.com/2
+,,333-333|Hey,"this is my policy section blah, linked to cre 333-333",3.3,https://example.com/3
+
+```