add doc in README

README.md

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+# PyVckit
+PyVckit is a library for:
+- sign verifiable credentials
+- verify verifiable credentials
+- generate verifiable presentations
+- verify verifiable submissions
+
+This library is strongly inspired by [SpruceId didkit](https://github.com/spruceid/didkit) and aims to maintain compatibility with it.
+
+For now the supported cryptography is only EdDSA with a signature Ed25519Signature2018.
+
+# Install
+For now the installation is from the repository:
+```sh
+    python -m venv env
+    source env/bin/activate
+    git clone https://gitea.pangea.org/ereuse/pyvckit.git
+    cd pyvckit
+    pip install -r requirements.txt
+    pip install -e .
+```
+
+#Cli
+The mode of use under the command line would be the following:
+
+## generate a key pair:
+```sh
+    python did.py -n keys > keypair.json
+```
+
+## generate a did identifier:
+```sh
+    python did.py -n did -k keypair.json
+```
+
+## generate an example signed credential:
+An example of a credential is generated, which is the one that appears in the credential_tmpl template in the file [templates.py](templates.py)
+```sh
+    python sign_vc.py -k keypair.json > credential_signed.json
+```
+
+## verify a signed credential:
+```sh
+    python verify_vc.py credential_signed.json
+```
+
+## generate a verifiable presentation:
+```sh
+    python sign_vp.py -k keypair.json -c credential_signed.json > presentation_signed.json
+```
+
+## verify a verifiable presentation:
+```sh
+    python verify_vp.py presentation_signed.json
+```
+
+# Use as a lib
+In the tests you can find examples of use. Now I will explain the usual cases
+
+## generate a key pair:
+```python
+    from pyvckit.did import generate_keys
+    key = generate_keys()
+```
+
+## generate a did identifier:
+```python
+    from pyvckit.did import generate_keys, generate_did
+    key = generate_keys()
+    did = generate_did(key)
+```
+
+## generate a signed credential:
+Assuming **credential** is a valid credential.
+**credential** is a string variable
+```python
+    from pyvckit.did import generate_keys, generate_did, get_signing_key
+    from pyvckit.sign_vc import sign
+
+    key = generate_keys()
+    did = generate_did(key)
+    signing_key = get_signing_key(key)
+    vc = sign(credential, signing_key, did)
+```
+
+## verify a signed credential:
+Assuming **vc** is a properly signed verifiable credential
+```python
+    import json
+    from pyvckit.verify import verify_vc
+
+    verified = verify_vc(json.dumps(vc))
+```
+
+## generate a verifiable presentation:
+```python
+    from pyvckit.did import generate_keys, generate_did, get_signing_key
+    from pyvckit.sign_vp import sign_vp
+
+    holder_key = generate_keys()
+    holder_did = generate_did(holder_key)
+    holder_signing_key = get_signing_key(holder_key)
+    vp = sign_vp(holder_signing_key, holder_did, vc_string)
+```
+
+## verify a verifiable presentation:
+```python
+    from pyvckit.verify_vp import verify_vp
+    verified = verify_vp(json.dumps(vp))
+```