docs: add bare API documentation

api.MD

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+## API documentation
+
+
+### Clients API (Hydra OAuth2 clients)
+
+GET /api/v0/clients 
+GET /api/v0/clients/{id}
+POST /api/v0/clients  --> [payload](https://www.ory.sh/docs/hydra/reference/api#tag/oAuth2/operation/createOAuth2Client)
+PUT /api/v0/clients/{id}  --> [payload](https://www.ory.sh/docs/hydra/reference/api#tag/oAuth2/operation/createOAuth2Client)
+DELETE /api/v0/clients/{id}
+
+
+### Identities API (Kratos identity)
+
+GET /api/v0/identities
+GET /api/v0/identities/{id}
+POST /api/v0/identities --> [payload](https://www.ory.sh/docs/kratos/reference/api#tag/identity/operation/createIdentity)
+PUT /api/v0/identities/{id} --> [payload](https://www.ory.sh/docs/kratos/reference/api#tag/identity/operation/updateIdentity)
+DELETE /api/v0/identities/{id}
+
+
+## IDProviders API 
+
+GET /api/v0/idps
+GET /api/v0/idps/{id}
+DELETE /api/v0/idps/{id}
+POST /api/v0/idps --> [payload](https://github.com/canonical/identity-platform-admin-ui/blob/main/pkg/idp/third_party.go)
+PATCH /api/v0/idps/{id} --> [payload](https://github.com/canonical/identity-platform-admin-ui/blob/main/pkg/idp/third_party.go)
+
+example below
+
+```json
+{
+  "id": "abcd",
+  "provider": "github",
+  "label": "gh",
+  "client_id": "randomstring",
+  "client_secret": "randomstring",
+  "issuer_url": "https://canonical.com",
+  "auth_url": "https://canonical.com/auth",
+  "token_url": "https://canonical.com/token",
+  "microsoft_tenant": "",
+  "subject_source": "",
+  "apple_team_id": "",
+  "apple_private_key_id": "",
+  "apple_private_key": "",
+  "scope": "openid,session",
+  "mapper_url": "https://canonical.com/mapper",
+  "requested_claims": {
+    "userinfo": {
+      "given_name": {
+        "essential": true
+      },
+      "nickname": null,
+      "email": {
+        "essential": true
+      },
+      "email_verified": {
+        "essential": true
+      },
+      "picture": null,
+      "http://example.info/claims/groups": null
+    },
+    "id_token": {
+      "auth_time": {
+        "essential": true
+      },
+      "acr": {
+        "values": [
+          "urn:mace:incommon:iap:silver"
+        ]
+      }
+    }
+  }
+}
+```
+
+
+## Identity Schemas API (Kratos Identity Schemas)
+
+GET /api/v0/schemas
+GET /api/v0/schemas/{id}
+POST /api/v0/schemas - [payload](###IdentitySchemaContainer)
+PATCH /api/v0/schemas/{id} - [payload](###IdentitySchemaContainer)
+DELETE /api/v0/schemas/{id}
+GET /api/v0/schemas/default
+PUT /api/v0/schemas/default 
+
+### IdentitySchemaContainer
+```json
+{
+   "id":"test",
+   "schema":{
+      "$id":"https://schemas.canonical.com/presets/kratos/test_v0.json",
+      "$schema":"http://json-schema.org/draft-07/schema#",
+      "title":"Admin Account",
+      "type":"object",
+      "properties":{
+         "traits":{
+            "type":"object",
+            "properties":{
+               "username":{
+                  "type":"string",
+                  "title":"Username",
+                  "ory.sh/kratos":{
+                     "credentials":{
+                        "password":{
+                           "identifier":true
+                        }
+                     }
+                  }
+               }
+            }
+         }
+      },
+      "additionalProperties":true
+   }
+}
+```
+
+
+## Rules API (Oathkeeper Access Rules)
+
+GET /api/v0/rules
+GET /api/v0/rules/{id}
+POST /api/v0/rules - [payload](https://www.ory.sh/docs/oathkeeper/reference/api#tag/api/operation/getRule) 
+PUT /api/v0/rules/{id} - [payload](https://www.ory.sh/docs/oathkeeper/reference/api#tag/api/operation/getRule)
+DELETE /api/v0/rules/{id}