Ueransim docs two slices (#341)

* tutorial for ueransim with two slices

* Update README.md

* ueransim and open5gs versions updated

docs/open5gs-and-ueransim-two-slices/README.md

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+# open5gs and ueransim with two slices
+
+This tutorial is an adaptation of the Open5GS and UERANSIM tutorial.
+
+The slices values were changed in the gNBs, and the NSSF and AMF configuration files were added in the config folder. Also, the SMF configuration file was modified, and the register_subscriber.sh script was updated with the new slice values.
+
+# Deployment NGC and register subscribers
+
+deploy the ngc core (open5gs) with:
+
+```
+docker compose -f ngc.yaml up -d
+```
+
+Register subscribers in ngc with `./register_subscriber.sh`.
+
+
+# Deploy gnodeb
+
+gnb1.yaml is configured to deploy 1 gnodeb (gnb1) and 3 ues:
+
+```
+docker compose -f gnb1.yaml up -d
+```
+
+You can use gnb2.yaml to deploy a second gnodeb (gnb2) with 3 additional ues:
+
+```
+docker compose -f gnb2.yaml up -d
+```
+
+
+# Test
+
+To test ue connectivity through RAN, enter the gnb1-ues1 container:
+
+```
+docker compose -f gnb1.yaml exec ues1 /bin/bash
+traceroute -i uesimtun0 google.es
+ping -I uesimtun0 google.es
+```
+ues container will have multiple interfaces (one for each ue). 
+You can try each tunnel providing the flag '-i' in traceroute and '-I' in ping.
+
+If you have deployed a second genodeb (gnb2) the command to enter in the ues container is:
+
+```
+docker compose -f gnb2.yaml exec ues2 /bin/bash
+```
+
+
+# Clean Up
+
+Undeploy with:
+
+```
+docker compose -f gnb1.yaml down
+docker compose -f gnb2.yaml down
+docker compose -f ngc.yaml down -v
+
+```

docs/open5gs-and-ueransim-two-slices/config/amf.yaml

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+logger:
+  path:
+    file: /opt/open5gs/var/log/open5gs/amf.log
+#  level: info   # fatal|error|warn|info(default)|debug|trace
+
+global:
+# max:
+#   ue: 1024 # The number of UE can be increased depending on memory size.
+#    peer: 64
+
+amf:
+  sbi:
+    server:
+    - dev: eth0
+      port: 7777
+    client:
+      #      nrf:
+      #        - uri: http://127.0.0.10:7777
+      scp:
+      - uri: http://scp:7777
+  ngap:
+    server:
+    - dev: eth0
+  metrics:
+    server:
+    - dev: eth0
+      port: 9090
+  guami:
+  - plmn_id:
+      mcc: 999
+      mnc: 70
+    amf_id:
+      region: 2
+      set: 1
+  tai:
+  - plmn_id:
+      mcc: 999
+      mnc: 70
+    tac: 1
+  plmn_support:
+    - plmn_id:
+        mcc: "999"
+        mnc: "70"
+      s_nssai:
+      - sd: "0x111111"
+        sst: "1"
+      - sd: "0x222222"
+        sst: "2"
+  security:
+    integrity_order: [NIA2, NIA1, NIA0]
+    ciphering_order: [NEA0, NEA1, NEA2]
+  network_name:
+    full: Open5GS
+    short: Next
+  amf_name: open5gs-amf0
+  time:
+    #    t3502:
+    #      value: 720   # 12 minutes * 60 = 720 seconds
+    t3512:
+      value: 540 # 9 minutes * 60 = 540 seconds

docs/open5gs-and-ueransim-two-slices/config/nssf.yaml

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+logger:
+  path:
+    file: /opt/open5gs/var/log/open5gs/nssf.log
+#  level: info   # fatal|error|warn|info(default)|debug|trace
+
+global:
+  max:
+#   ue: 1024 # The number of UE can be increased depending on memory size.
+#    peer: 64
+
+nssf:
+  sbi:
+    server:
+    - dev: eth0
+      port: 7777
+    client:
+      #      nrf:
+      #        - uri: http://127.0.0.10:7777
+      scp:
+      - uri: http://scp:7777
+      nsi:
+      - uri: http://nrf:7777
+        s_nssai:
+          sst: 1
+          sd: 0x111111
+      - uri: http://nrf:7777
+        s_nssai:
+          sst: 2
+          sd: 0x222222